Which two statements are correct regarding routing protocol authentication?

A.	MD5 authentication can only be established between Internal BGP peers.
B.	Authentication can be established using keychains on one peer and MD5 hashing on the other.
C.	UDP port 179 is used for BGP session authentication.
D.	MD5 passwords are never sent to a peer.
E.	Routers authenticate each routing update packet received.
F.	BGP peers can be configured with different passwords.