If a Certificate Authority $($CA$)$ makes a mistake and issues a wrong certificate, it can be addressed by:

Group of answer choices

CA issuing a Certificate Revocation List $($CRL$)$ and the entities periodically downloading the CRL to check if a certificate is valid

CA attaching an expiration date to every certificate and the entities checking if a certificate is current

An entity assuming every certificate is invalid if the CA cannot be reached for downloading the CRL

All of the above