In the network connection as shown in the figure, SWA and SWB enable STP and Loopback-detection at the same time. Please confirm that the port status description of SWA and SWB is correct.

In the network connection as shown in the figure, SWA and SWB enable STP and Loopback-detection at the same time. Please confirm that the port status description of SWA and SWB is correct.
A . G1/0/1 of SWA may be blocked by STP detecting the existence of a loop
B . STP detects the existence of a loop between G1/0/2 or G1/0/3 of SWB and blocks one of them
C . Between G1/0/2 and G1/0/3 of SWB, loopback-detection detects the existence of a loop and blocks one of them

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Answer: B