Which statement when you are upgrading the firmware on an HA cluster made up of three FortiAnalyzer devices is true?

Which statement when you are upgrading the firmware on an HA cluster made up of three FortiAnalyzer devices is true?
A . You can perform the firmware upgrade using only a console connection.
B . All FortiAnalyzer devices will be upgraded at the same time.
C . Enabling uninterruptible-upgrade prevents normal operations from being interrupted during the upgrade.
D . First, upgrade the secondary devices, and then upgrade the primary device.

Answer: D

Explanation:

When upgrading firmware on an HA cluster of FortiAnalyzer devices, it is recommended to upgrade the secondary devices first, and then upgrade the primary device to minimize downtime and maintain continuity in log collection and other HA functions. This ensures that the primary device continues to handle operations while the secondary devices are being upgraded, and once the secondary devices are updated, the primary device can be upgraded with minimal service disruption.