A. Secondary device with highest priority will automatically be promoted to the primary role, and manually reconfigure all other secondary devices to point to the new primary device

B. FortiManager HA state transition is transparent to administrators and does not require any reconfiguration.

C. Reboot one of the secondary devices to promote it automatically to the primary role, and reconfigure all other secondary devices to point to the new primary device.

D. Manually promote one of the secondary devices to the primary role, and reconfigure all other secondary devices to point to the new primary device.