As shown in the title figure, SWA, SWB, SWC and SWD have STP enabled. SWA, SWB and SWC form a loop. After the topology is stable, SWD and SWB are connected. Assuming that the cost of each link is the same, which of the following statements about the topology change process of STP are correct?

As shown in the title figure, SWA, SWB, SWC and SWD have STP enabled. SWA, SWB and SWC form a loop. After the topology is stable, SWD and SWB are connected. Assuming that the cost of each link is the same, which of the following statements about the topology change process of STP are correct?

A . SWD will send TCN BPDU from port E0/1
B . SWB will send TCN BPDU from port E0/2
C . If the link between SWC and SWA is disconnected, SWC will send a TCN BPDU from port E0/3
D . If the link between SWB and SWC is disconnected, both SWB and SWC will send TCN BPDUs from port EO/2.

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Answer: B