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The correct answer is C.

OBJ-4.4: ISAKMP is used in IPsec, which is commonly used in securing the key exchange during the establishment of a client-to-server VPN connection. TKIP (Temporal Key Integrity Protocol) is an encryption protocol included as part of the IEEE 802.11i standard for wireless LANs (WLANs). Kerberos is a computer network authentication protocol that works based on tickets to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner. The Advanced Encryption Standard (AES) is a symmetric key encryption and is not used for key exchanges.

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