As shown in the figure, SWA, SWB, and SWC all run RSTP. What are the port roles of the GEO/O/2 port on SWB and the GEO/D/1 port on SWC?
A . Backup port, Root port
B . Alternative port, Backup port
C . Root port, Designate port
D . backup port, alternative port
Answer: D
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