Regarding the description of VRRP fast switching, the error is: (Multiple Choice)
A . When the VRRP backup group monitoring the common BFD, the status of the common BFD changed, VRRP backup group will modify the priority of the backup group to change the active/standby status; when the status of monitored BFD session is restored, the priority of the router in the backup group is return to the riginal value.
B . If multiple BFDs are monitored at the same time. Then the various configurations are related to each other and may have an impact.
C . Use VRRP to monitor the BFD session or EFM function. After the BFD session or EFM session status changes, the VRRP module is notified to implement the VRRP fast switching.
D . A VRRP backup group cannot monitor Peer BFD, Link BFD, and Normal BFD at the same time.
Answer: BD