Based on the output, what is the status of the communication between FortiGate and FortiSwitch?

Examine the following output from the FortiLink real-time debug.

Based on the output, what is the status of the communication between FortiGate and FortiSwitch?
A . FortiGate is unable to authorize the FortiSwitch.
B . FortiGate is unable to establish FortiLink tunnel to manage the FortiSwitch.
C . FortiGate is unable to located a previously managed FortiSwitch.
D . The FortiLink heartbeat is up.

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Answer: D