Which three options correctly describe the AH protocol? (Choose three.)
A. The AH protocol encrypts the entire IP and upper layer protocols for security.
B. The AH protocol provides connectionless integrity and data origin authentication.
C. The AH protocol provides protection against replay attacks.
D. The AH protocol supports tunnel mode only.
E. The AH protocol uses IP protocol 51.
F. The AH protocol supports IPv4 only.
