Which of the following descriptions about the heartbeat interface is wrong ()? [Multiple choice]

Which of the following descriptions about the heartbeat interface is wrong ()? [Multiple choice]
A . It is recommended to configure at least two heartbeat interfaces. – One heartbeat interface is used as the master, and the other heartbeat interface is used as the backup.
B. The interface MTU value is greater than 1500 and cannot be used as a heartbeat interface
C. The connection method of the heartbeat interface can be directly connected, or it can be connected through a switch or router
D. MGMT interface (GigabitEthernet0/0/0) cannot be used as heartbeat interface

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Answer: B