Which statements about the firmware upgrade process on an active-active HA cluster are true? (Choose two.)

Which statements about the firmware upgrade process on an active-active HA cluster are true? (Choose two.)
A . The firmware image must be manually uploaded to each FortiGate.
B . Only secondary FortiGate devices are rebooted.
C . Uninterruptable upgrade is enabled by default.
D . Traffic load balancing is temporally disabled while upgrading the firmware.

Answer: B, D