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