CRL

https://ru.wikipedia.org/wiki/Certificate_Revocation_List

Certificate Revocation List (or CRL) is "a list of digital certificates that have been revoked by the

issuing certificate authority (CA) before their scheduled expiration date and should no longer be

trusted".

Incorrect answers:

RA - Used to proxy the certificate requests on behalf of the user and validate whether or not they are

legitimate instead of having the user go directly to the CA. The RA talks to the subordinate CA on

behalf of the user, which makes it harder for the actor to get directly to the certificate authority and

do harm.

RFC – Request for Comments (RFC) is a publication from the Internet Society (ISOC) and its

associated bodies, most prominently the Internet Engineering Task Force (IETF), the principal

technical development and standards-setting bodies for the Internet.

CA - certificate authority or certification authority is an entity that issues digital certificates