Which feature is supported when implementing an IPsec VPN configuration using IKEv2?

A.
IKEv2 authentication can be configured to negotiate authentication modes within the IKE policy
when using Cisco ASDM.

B.
IKEv2 proposals are identical to IKEv1 policies.

C.
When implementing IKEv2 with a site-to-site VPN, authentication parameters should contain a
fallback to to PSKs, in case certificate-based authentication fails.

D.
IKEv2 peer authentication can be implemented with asymmetric authentication methods.