According to the daul hot standby network diagram, the following are the descriptions about the daul hot standby preemption function, which are correct? (Select 3 Answers)

A . VRRP backup group itself has preemption function. In the figure, when USG_A fails and is restored, USG_A will use the preemption function to back into master state.
B . The preemption function of the VGMP management group is similar to the VRRP backup group. When the faulty backup group in the management group recovers, the priority of the management group is restored.
C . By default, the preemption delay is 0 and never preempts.
D . When the VRRP backup group is added to the VGMP management group, the original preemption function on the backup group will be invalid. The preemption takes action or not must be determined by the VGMP management group.

Answer: ABD