The figure shows the networking application of RRPP. The customer LAN switches SWA, SWB, SWC, and SWD form the RRPP ring main ring 1, switches SWB, SWC, and SWE form sub-ring 2, and switches SWB, SWC, and SWF form sub-ring 3. If switch SWE is the master node of sub-ring 2, SWF is the master node of sub-ring 3, and switch SWB is the edge node of sub-ring 2 and sub-ring 3, in order to eliminate the defect of broadcast storm under specific conditions of RRPP dual-homing networking, which of the following can be known from the above information?

The figure shows the networking application of RRPP. The customer LAN switches SWA, SWB, SWC, and SWD form the RRPP ring main ring 1, switches SWB, SWC, and SWE form sub-ring 2, and switches SWB, SWC, and SWF form sub-ring 3. If switch SWE is the master node of sub-ring 2, SWF is the master node of sub-ring 3, and switch SWB is the edge node of sub-ring 2 and sub-ring 3, in order to eliminate the defect of broadcast storm under specific conditions of RRPP dual-homing networking, which of the following can be known from the above information?

A . If the link between switch SWA and switch SWD is down, the edge port on switch SWB will be blocked.
B . If the link between switch SWB and switch SWC is in Down state, the edge port on switch SWB will be blocked.
C . If the link between switch SWA and switch SWB is down, and the link between switch SWB and switch SWC is down, the edge port on switch SWB will be blocked.
D . If the link between switch SWA and switch SWB is down, and the link between switch SWA and switch SWD is down, the edge port on switch SWB will be blocked.

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Answer: C