Which two statements are correct regarding routing protocol authentication? (Choose two.)

Which two statements are correct regarding routing protocol authentication? (Choose two.)
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.

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Answer: D,E