Which protection is provided by the spanning tree root guard feature enabled on a switch port?

Which protection is provided by the spanning tree root guard feature enabled on a switch port?
A . Advertises the switch as the spanning tree root
B . Forces the port to become the spanning tree root port
C . Filters all inferior BPDUs received on the port
D . Moves the port to a root-inconsistent state if a superior BPDU is received

Answer: D

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