What is the most possible cause of this problem?

The Cisco AnyConnect client fails to connect via IKEv2 but works with SSL. The following
error message is displayed:
“Login Denied, unauthorized connection mechanism, contact your administrator”
What is the most possible cause of this problem?

A.
DAP is terminating the connection because IKEv2 is the protocol that is being used.

B.
The client endpoint does not have the correct user profile to initiate an IKEv2 connection.

C.
The AAA server that is being used does not authorize IKEv2 as the connection
mechanism.

D.
The administrator is restricting access to this specific user.

E.
The IKEv2 protocol is not enabled in the group policy of the VPN headend.