gabrielle.org
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:8c:3d:e7:7b:a4:cc:cc:ae:a0:e6:b3:ed:48:d1:a7:95:c0 was issued on by Let's Encrypt.
This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.
We have idenified some issues with this certificate:
- Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)
Certificate Subject
CN=gabrielle.org
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:8c:3d:e7:7b:a4:cc:cc:ae:a0:e6:b3:ed:48:d1:a7:95:c0Serial Number (int): 309058674000322508527198906575257659217344
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 33:3c:24:67:ed:d0:c7:f3:4b:2d:e4:37:12:d4:11:1f:f4:a1:65:7d
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 8a:26:56:05:fa:65:19:06:fb:c1:7f:da:3c:c2:1a:5b:ab:f8:f3:3a
Fingerprint (sha256): 30:35:b0:e3:e9:4b:86:ed:34:b1:e7:55:4d:85:70:c7:c6:d0:b4:3b:66:a3:a5:79:76:f1:76:ac:ec:7d:1c:2a
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate gabrielle.org
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for gabrielle.org
Public Key Algorithm
RSA
Key Size
4096
Signature Algorithm
SHA256 with RSA
Key Usage
Digital Signature
Key Encipherment
Extended Key Usages
Server Authentication
Client Authentication
Extensions
9 extensions
No
unhandled critical extensions
CA Certificate
This is not a CA certificate
Subject Alternative Names
gabrielle.org
Other certificates including the domain name gabrielle.org
(limited to 100 certificates)
gabrielle.org
gabrielle.org
gabrielle.org
www.gabrielle.org
gabrielle.org
gabrielle.org
www.sonac.co
www.traslochiabitazione.com
castelnuovorangone.org
www.gabrielle.org
gabrielle.org
gabrielle.org
www.hotelgellert.com
www.gabrielle.org
www.gabrielle.org
www.gabrielle.org
pasma.co
gabrielle.org
www.gabrielle.org
gabrielle.org
gabrielle.org
gabrielle.org
www.gabrielle.org
gabrielle.org
gabrielle.org
www.sonac.co
www.traslochiabitazione.com
castelnuovorangone.org
www.gabrielle.org
gabrielle.org
gabrielle.org
www.hotelgellert.com
www.gabrielle.org
www.gabrielle.org
www.gabrielle.org
pasma.co
gabrielle.org
www.gabrielle.org
gabrielle.org
Certificate
The complete raw certificate details for gabrielle.org in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGUTCCBTmgAwIBAgISA4w953ukzMyuoOaz7UjRp5XAMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0yMDAyMjQwODAyMjFaFw0y MDA1MjQwODAyMjFaMBgxFjAUBgNVBAMTDWdhYnJpZWxsZS5vcmcwggIiMA0GCSqG SIb3DQEBAQUAA4ICDwAwggIKAoICAQDQ4hnv+w4P2Sd+yty0JT7N65jZimSV2Qb4 piivJuVAx5m60ARK9830L/7qZwPrK1h2OOI12FA+iDKi38Zq4i/knWBguVpxrPt+ LTnxIVZ70MOBluZleR0YHAmblCIWMJszzHYFPa8TfkGecUnYp1/53pRKbqUApb8k YouK92lqhs6KVsioenWqsJipB32nj1TR/9gslJ1I6ooSDVOHHf896+qjHAQzm2sO TtEPvUPPIFs85jay1OYv+h7AMlGnLi3rLk7KnuyewgFwoM3YZxB/zpkmuPDiS+3y yMCskuINRNczp2xmlnh4l82FPiXMzqXWntcTu3MLbMXP9cRRt0WzuvqJQ/VzZV2B UIiOGrnXPYddr0keCqN0d5qF5yLdfS9ryYtfWACzme2YpNFvoHwJAPnjnTAsYnG4 i7Bl38GN1lBRFdzLfM0us+Z6KB7w2JW312SOP/L6j4/KEnvTTjdOWZTnBkUNimG5 yARg+TrpbFTGTmkYlobgeU35ePcJ9ZtGHkScWrJqaH/D9L0F6ioZypCOj2ocVZdB VyQ+XmUJV+48ni7Ct/vlV07Zsr+m5H6hMFYcIBr0RYwecdBT4aVsNR1aj+zgHH+A UqtPaFTeitwEX1zVUMZ/Z4i1FFJuEMPQ6ocEfHVN3MYws8D1hnNbI/fkepVUHXzx RVPpZW2ndwIDAQABo4ICYTCCAl0wDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQG CCsGAQUFBwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBQzPCRn 7dDH80st5DcS1BEf9KFlfTAfBgNVHSMEGDAWgBSoSmpjBH3duubRObemRWXv86js oTBvBggrBgEFBQcBAQRjMGEwLgYIKwYBBQUHMAGGImh0dHA6Ly9vY3NwLmludC14 My5sZXRzZW5jcnlwdC5vcmcwLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14 My5sZXRzZW5jcnlwdC5vcmcvMBgGA1UdEQQRMA+CDWdhYnJpZWxsZS5vcmcwTAYD VR0gBEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEFBQcCARYa aHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEDBgorBgEEAdZ5AgQCBIH0BIHx AO8AdgDnEvKwN34aYvuOyQxhhPHqezfLVh0RJlvz4PNL8kFUbgAAAXB2btwAAAAE AwBHMEUCICQGNMePrF2/jj3MJQrnLwg+Ql6NvW5B03JHOCVAWFqTAiEAxgNl7dOl nq0KlmgWWVO03Z9z17zLIoYzpJU8laGrNl4AdQCyHgXMi6LNiiBOh2b5K7mKJSBn a9r6cOeySVMt74uQXgAAAXB2btw4AAAEAwBGMEQCIF3M0kpulJzMS1/WbR/LNQof i+hW+3cbDAcnmP3P03qBAiBr+IQI78HmWKrZtwTjJY/yngfomzlhCX66cWwp6Dko DzANBgkqhkiG9w0BAQsFAAOCAQEAHYYMc/Flc1bup5/BrUSXUZN/FoRSRNpIKnvO skRY681CmTEDCIzqH38qurqY4t7Bcy+qRNUlloWW6IyjeGodfi+kELnlBT8gWNoI paxMMX/olQ1i5JltXBfqMTQ/4pOPyUUEj1U/3/ZMe6cpx90vmFwafs6mJhbf+26V JCTMwLlc8+thjaaExyK4nBCRPOGi+oWpNdlpLrwCdk5psMnf5m6+GAGZko6t5eGn Vb9eZGNNMv4hJo5OgdBzGsi7cMf8JDiIQdq4QrtxfrrJsG7fP5e5JB7t/68Ub7Gs 2x/aebxc+VjvprM230EddeZ6xLIIpgD979RvISXdfgNkI4fr3A== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA0OIZ7/sOD9knfsrctCU+ zeuY2YpkldkG+KYoryblQMeZutAESvfN9C/+6mcD6ytYdjjiNdhQPogyot/GauIv 5J1gYLlacaz7fi058SFWe9DDgZbmZXkdGBwJm5QiFjCbM8x2BT2vE35BnnFJ2Kdf +d6USm6lAKW/JGKLivdpaobOilbIqHp1qrCYqQd9p49U0f/YLJSdSOqKEg1Thx3/ PevqoxwEM5trDk7RD71DzyBbPOY2stTmL/oewDJRpy4t6y5Oyp7snsIBcKDN2GcQ f86ZJrjw4kvt8sjArJLiDUTXM6dsZpZ4eJfNhT4lzM6l1p7XE7tzC2zFz/XEUbdF s7r6iUP1c2VdgVCIjhq51z2HXa9JHgqjdHeaheci3X0va8mLX1gAs5ntmKTRb6B8 CQD5450wLGJxuIuwZd/BjdZQURXcy3zNLrPmeige8NiVt9dkjj/y+o+PyhJ70043 TlmU5wZFDYphucgEYPk66WxUxk5pGJaG4HlN+Xj3CfWbRh5EnFqyamh/w/S9Beoq GcqQjo9qHFWXQVckPl5lCVfuPJ4uwrf75VdO2bK/puR+oTBWHCAa9EWMHnHQU+Gl bDUdWo/s4Bx/gFKrT2hU3orcBF9c1VDGf2eItRRSbhDD0OqHBHx1TdzGMLPA9YZz WyP35HqVVB188UVT6WVtp3cCAwEAAQ== -----END PUBLIC KEY-----
ASN.1 decoded
[c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2 . . . . . . . . [c:0|t:2|false] INTEGER 309058674000322508527198906575257659217344 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6 (countryName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10 (organizationName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt Authority X3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-02-24 08:02:21 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-05-24 08:02:21 +0000 UTC . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'gabrielle.org' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1 (rsaEncryption) . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (4208 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 852169141542771890983273781727059847532090811370002596253343329393572666422923936363644177982944605687102704953094183364893563153742328608910350769820108599105104554683098105993143073590704164319596917629383948763429517594778672402562357957328307885469066221714607990150373549021162011465991477394371791792368465892190513699500663050577974746840056898587155678557215813526069130347291968521171851264479806146424184535377031958157085685203336041708524761924149355080307123372451421392921243722685088782051732280479394020054388097645045432953565649832803019245944788810255621895740084040571499782072016465994259828871027056449556978528134159038055436218718168527345859505397217117594999219502983742506703347723459277470435662365671183402781226946262103438577700448506324048715624909733845785946986804715369576836227776755431622157596445917185246618544386269941179228343414725784572368296123482885111233749854189930882050743751982644458093429877366372935404474449829937968510303290986200739049797750037487268073323976736180029235264083717756940324416544218322471903966593872900653063798892982853544962937195613827379165079816924864766750810527239366621429082412544884465019813301547010851519943000606858056043332806383760443258237200247 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537 . . . . . . . . [c:2|t:3|true] ORAddress . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15 (keyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits) 05a0 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37 (extKeyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1 (serverAuth) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.14 (subjectKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes) 333c2467edd0c7f34b2de43712d4111ff4a1657d . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName a84a6a63047dddbae6d139b7a64565eff3a8eca1 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (99 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://ocsp.int-x3.letsencrypt.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://cert.int-x3.letsencrypt.org/' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (17 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'gabrielle.org' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (69 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1 (Domain Validation Certificates Policy) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.44947.1.1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes) 00ef007600e712f2b0377e1a62fb8ec90c6184f1ea7b37cb561d11265bf3e0f34bf241546e00000170766edc0000000403004730450220240634c78fac5dbf8e3dcc250ae72f083e425e8dbd6e41d37247382540585a93022100c60365edd3a59ead0a9668165953b4dd9f73d7bccb228633a4953c95a1ab365e007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e00000170766edc38000004030046304402205dccd24a6e949ccc4b5fd66d1fcb350a1f8be856fb771b0c072798fdcfd37a8102206bf88408efc1e658aad9b704e3258ff29e07e89b3961097eba716c29e839280f . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 001d860c73f1657356eea79fc1ad449751937f16845244da482a7bceb24458ebcd42993103088cea1f7f2ababa98e2dec1732faa44d525968596e88ca3786a1d7e2fa410b9e5053f2058da08a5ac4c317fe8950d62e4996d5c17ea31343fe2938fc945048f553fdff64c7ba729c7dd2f985c1a7ecea62616dffb6e952424ccc0b95cf3eb618da684c722b89c10913ce1a2fa85a935d9692ebc02764e69b0c9dfe66ebe180199928eade5e1a755bf5e64634d32fe21268e4e81d0731ac8bb70c7fc24388841dab842bb717ebac9b06edf3f97b9241eedffaf146fb1acdb1fda79bc5cf958efa6b336df411d75e67ac4b208a600fdefd46f2125dd7e03642387ebdc