Which of the following statements about VRRP fast switchover are true? (Choose three.)

Which of the following statements about VRRP fast switchover are true? (Choose three.)

A. When VRRP is used to track a BFD or EFM session, if a tracked BFD or EFM session status changes, the BFD or EFM module notifies the VRRP module of the change. After that, the VRRP module implements a rapid master/backup switchover. B. A VRRP backup group can monitor a peer BFD session, a link BFD session, and a normal BFD session at the same time. In addition, it can monitor the interface status. C. When the status of a BFD session detected by a VRRP backup group changes, the master/slave switchover of routers in the VRRP backup group occurs by changing priorities of the master and slave routers. D. A VRRP backup group can monitor several BFD sessions at the same time. The status changes of these BFD sessions affect each other.