Which three statements about IKEv2 are correct? (Choose three.)

A.
INITIAL_CONTACT is used to synchronize state between peers.

B.
The IKEv2 standard defines a method for fragmenting large messages.

C.
The initial exchanges of IKEv2 consist of IKE_SA_INIT and IKE_AUTH.

D.
Rekeying IKE and child SAs is facilitated by the IKEv2 CREATE_CHILD_SA exchange.

E.
NAT-T is not supported.

F.
Attribute policy push (via the configuration payload) is only supported in
REQUEST/REPLY mode.