Which action could have caused the following output to appear on a switch? %SPANTREE-2-
ROOTGUARDBLOCK: Port 1/1 tried to become non-designated in VLAN 77. Moved to rootinconsistent state

A.
The switch is configured with Loop Guard and stops receiving BPDUs.

B.
The switch is configured withPortFast and starts receiving BPDUs.

C.
The switch is configured with Root Guard and starts receiving superior BPDUs.

D.
The switch is configured withBackboneFast and starts receiving inferior BPDUs.