Which two descriptions of the keying mechanisms that are used to distribute the session keys used in routing authenticat

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Which two descriptions of the keying mechanisms that are used to distribute the session keys used in routing authentication are true? (Choose two.)

A. Peer keying creates a unique one-to-one relationship with another peer.
B. Group keying creates a single keying message to multiple peers.
C. Peer keying creates a single keying message to multiple peers.
D. Group keying creates a unique one-to-one relationship with another peer.
E. Group keying creates a full mesh of keying sessions to all devices.
F. Peer keying creates a full mesh of keying sessions to all devices.