which two functions is the pre-shared key used?

When the pre-shared key authentication method is used for WPA or WPA2, for which two functions is the pre-shared key used? (Choose two.)

A.
to act as the Group Transient Key during the bidirectional handshake

B.
to act as the Pairwise Master Key during the bidirectional handshake

C.
to derive the nonce at each side of the exchange

D.
to derive the Pairwise Transient Key

Explanation: