Which interfaces on FortiSwitch send out FortiLink discovery frames by default in order to detect a FortiGate with an enabled FortiLink interface?

Which interfaces on FortiSwitch send out FortiLink discovery frames by default in order to detect a FortiGate with an enabled FortiLink interface?
A . All ports have auto-discovery enabled by default.
B . No ports are enabled by default for auto-discovery. This must be configured under config switch interface.
C . The ports with auto-discovery enabled by default are dependent upon the FortiSwitch model.
D . The last four switch ports on FortiSwitch have auto-discovery enabled by default.

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Answer: A