A certificate authority needs to post information about expired certificates. Which of the following would accomplish this task?

A Certificate Revocation List (CRL) is a list of digital certificates that have been revoked by the Certificate Authority (CA) before their scheduled expiration date and should no longer be trusted. CAs publish CRLs periodically to inform relying parties about invalid certificates. TPM (Trusted Platform Module) is a hardware security module used for cryptographic operations and secure storage, not for publishing revoked certificates. PKI (Public Key Infrastructure) is the overall framework for managing digital certificates, but the CRL is the specific component for revoked certificate information. CSR (Certificate Signing Request) is a request sent to a CA to obtain a digital certificate, not a list of revoked ones.