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.)

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

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Answer: B, D