Which one of the following actions should be taken by a client to verify the entity that they received a certificate from is the entity that should be using the certificate?

Which one of the following actions should be taken by a client to verify the entity that they received a certificate from is the entity that should be using the certificate?
A . Send a message encrypted with the system’s peer’s public key to verify that the peer can decrypt the message with the private key of the entity that is identified in the certificate.
B . Decrypt the certificate signature using the CA private key and check to make sure that the certificate hash matches what they received from the peer.
C . Ensure that the issuer and the subject match on the certificate of the peer.
D . Contact the CA by phone to determine how they validated the identity of the system during certificate enrollment of the peer that they are communicating with.

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Answer: A