In the event that one of the secondary FortiManager devices fails, which action must be performed to return the FortiManager HA manual mode to a working state?

In the event that one of the secondary FortiManager devices fails, which action must be performed to return the FortiManager HA manual mode to a working state?
A . The FortiManager HA state transition is transparent to administrators and does not require any reconfiguration.
B . Reboot the failed device to remove its IP from the primary device.
C . Manually promote one of the working secondary devices to the primary role, and reboot the old primary device to remove the peer IP of the failed device.
D . Reconfigure the primary device to remove the peer IP of the failed device.

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Answer: D