When an interface is configured with PortFast BPDU guard, how does the interface respond when it receives a BPDU?

When an interface is configured with PortFast BPDU guard, how does the interface respond when it receives a BPDU?
A . It continues operating normally.
B . It goes into a down/down state.
C . It becomes the root bridge for the configured VLA
E . It goes into an errdisable state.

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Answer: D