In checking the digital signature, the verifier . a. decrypts the digital signature it received with the supplicant public key to get the message digest b. hashes the plaintext message with the same algorithm used by the sender to get the message digest c. Both decrypts the digital signature it received with the supplicant public key to get the message digest and hashes the plaintext message with the same algorithm used by the sender to get the message digest d. Neither decrypts the digital signature it received with the supplicant's public key to get the message digest nor hashes the plaintext message with the same algorithm used by the sender to get the message digest