Which statement is true if the spanning tree enhancement Root Guard is enabled?

Which statement is true if the spanning tree enhancement Root Guard is enabled?

A.
If BPDUs are received on aPortFast enabled port, the port is disabled.

B.
If inferior BPDUs are received on a root port, all blocked ports become alternate paths to the
root bridge.

C.
If superior BPDUs are received on a designated port, the interface is placed into the rootinconsistent blocked state.

D.
If BPDUs are not received on anondesignated port, the port is moved into the STP loopinconsistent blocked state.