Which three statements are true about PPP CHAP authentication? (Choose three)

Which three statements are true about PPP CHAP authentication? (Choose three)
A . PPP encapsulation must be enabled globally.
B . The LCP phase must be complete and in closed state.
C . The hostname used by a router for CHAP authentication cannot be changed.
D . PPP encapsulation must be enabled on the interface.
E . The LCP phase must be complete and in open state.
F . By default, the router uses its hostname to identify itself to the peer.

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Answer: D, E, F