When no spanning-tree bpdu guard enable is configured in f0/7, which is true? (There’s an exhibit that shows f0/7 receive BPDU.)

When no spanning-tree bpdu guard enable is configured in f0/7, which is true? (There’s an exhibit that shows f0/7 receive BPDU.)
A . We have to configure shutdown and no shutdown.
B . Have to use errdisable recovery
C . UDLD reset
D . Network administrator must disable spanning-tree protocol

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Answer: A