What is the difference between initiator-based and mutual CHAP authentication?

A.
Initiator CHAP validates the initiator secret against the one stored on the array. Mutual CHAP is bi-directional authentication.

B.
Initiator CHAP validates the target secret against the one stored on the initiator. Mutual CHAP is bi-directional authentication.

C.
Initiator CHAP validates the server name against the table of servers registered to the array. Mutual CHAP validates the array serial number against a server target table.

D.
Initiator CHAP validates the server name against the table of servers registered to the array. Mutual CHAP allows multiple servers to logon to the array with the same secret.