Of all the parameters that are negotiated for the IKE Phase 1 tunnel, which parameter is the only one that does not have to exactly match between VPN pees to be accepted?

Of all the parameters that are negotiated for the IKE Phase 1 tunnel, which parameter is the only one that does not have to exactly match between VPN pees to be accepted?
A . DH group
B . Authentication method
C . Hashing algorithm
D . Digital signature
E . Lifetime
F . Encryption algorithm

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Answer: C