What is a certificate revocation list (CRL)?
A. A list of root certificates of CA servers that can revoke certificates.
B. A list of certificates, based on their serial numbers, that had initially been issued by a CA but have not been revoked and are trusted.
C. A list of certificates, based on their serial numbers, that had initially been issued by a CA but have since been revoked and as a result should not be trusted.
D. A list of serial numbers of CA servers that can participate in a certificate revocation process.
