Which of the following description about the group management for VGMP is wrong?

Which of the following description about the group management for VGMP is wrong?
A . Master/slave status change of VRRP backup group needs to notify its VGMP management group
B . The interface type and number of two firewalls heartbeat port may be different, as long as they can communicate with each other
C . Periodically sends Hello packets between VGMP of master/slave firewall
D . master/slave devices exchange packets to understand each other through the heartbeat line, and backup the related commands and status information

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Answer: B