What action does FortiSwitch take when it receives a loop guard data packet (LGDP) that was sent by itself?

What action does FortiSwitch take when it receives a loop guard data packet (LGDP) that was sent by itself?
A . The receiving port is shut down
B . The sending port is shut down
C . The receiving port is moved to the STP blocking state
D . The sending port is moved to the STP blocking state

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Answer: B