Which two statements about the IPv6 OSPFv3 authentication Trailer are true (choose
two)

A.
The AT-bit resides in the OSPFv3 Header field

B.
The IPv6 Payload length includes the length of the authentication Trailer

C.
It Provide an alternative option to OSPFv3 IPsec authentication

D.
The AT-bit must be set only in OSPFv3 Hello packets that include an Authentication
Trailer

E.
The AT-bit must be set only in OSPFv3 Database Description packets that include an
Authentication Trailer

F.
The OSPFv3 packet length includes the length of the Authentication Trailer