Bob sends nonce to Alice, this nonce is the challenge, Alice must respond with the hash of her password, which proves that the response was generated by Alice, and the nonce, which proves that the response is fresh and not a replay. This protocol type is

A$.$ CHAP

$($Challenge$-$Handshake

B$.$ Password Authentication Protocol

Authentication Protocol$)$

$($PAP$)$

C$.$ Digital Signature Protocols

D$.$ Kerberos