Which of the following keys is used to encrypt and decrypt all broadcast and multicast transmissions between the supplicant and an authenticator?

A.
Master Key

B.
Temporal Key

C.
Group Temporal Key

D.
Pairwise Transient Key

Explanation:
Group Temporal Key (GTK) is used to encrypt and decrypt all broadcast and multicast transmissions between the supplicant and an authenticator.
Answer option D is incorrect. Pairwise Transient Key (PTK) is used to encrypt and decrypt all unicast transmissions between the supplicant and an authenticator. Each PTK is used uniquely between each individual supplicant and an authenticator.
Answer option B is incorrect. Temporal Key is used in encrypting and decrypting the MSDU payload of IEEE 802.11 data frames between the supplicant and an authenticator. Answer option A is incorrect. Master Key is not used in encrypting and decrypting IEEE 802.11 data frames.