Which of the following is not true about IKEv2?
A. IKEv1 Phase 1 has two possible exchanges: main mode and aggressive mode. There is a single exchange of a message pair for IKEv2 IKE_SA.
B. IKEv2 has a simple exchange of two message pairs for the CHILD_SA. IKEv1 uses an exchange of at least three message pairs for Phase 2.
C. IKEv1 has a simple exchange of two message pairs for the CHILD_SA. IKEv2 uses an exchange of at least three message pairs for Phase 2.
D. IKEv2 is used in VPN technologies such as FlexVPN.
