During the establishment of an Easy VPN tunnel, when is XAUTH performed?

A.
at the end of IKEv1 Phase 2

B.
at the beginning of IKEv1 Phase 1

C.
at the end of Phase 1 and before Phase 2 starts in IKEv1 and IKEv2

D.
at the end of Phase 1 and before Phase 2 starts in IKEv1

Explanation: