The most strongly supported answer is A. The study guide explicitly states: “In the case of having multiple FortiOS firmware versions on the same ADOM, it is recommended to use separate ADOMs instead.” It also says: “When you organize managed FortiGate devices, it is highly recommended that you group them based on their FortiOS firmware version. This is because valid command syntax varies by firmware version, which affects script compatibility.”
D is the other practical fix supported by FortiManager workflow. The study guide states that FortiManager can run scripts on multiple managed devices at once, and device groups let you run scripts on multiple devices instead of a single device. Combined with the firmware-version compatibility rule above, the correct operational approach is to keep version-specific scripts and apply them only to the matching device sets. B and C are not supported by the uploaded study guide as the recommended fix.
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