A FortiManager administrator notices that a managed FortiGate is showing as 'Unregistered' in the Security Fabric topology. What is the most likely cause?
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A
The FortiGate's serial number is not added to FortiManager's device list
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B
The FortiGate has a mismatched firmware version with FortiManager
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C
The Security Fabric root has not authorized the FortiGate as a downstream device
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D
FortiAnalyzer is offline and cannot validate the device