A monitored interface on a clustered pair of ScreenOS devices goes down and both devices became
ineligible to be master of the cluster. As a result, neither device is passing traffic.
Which step would have prevented this situation?

A.
Configure initial hold-down time to 10 seconds.

B.
Configure the preempt parameter and a higher priority on one of the devices.

C.
Configure the lost heartbeat interval to 1 second.

D.
Configure the master-always-exists parameter.