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单项选择题 Refer to the exhibit. In the diagram, the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state?（）

A、GE-1/2 and GE 2/1

B、GE-1/1 and GE-2/2

C、GE-3/2 and GE 4/1

D、no ports are in the blocking state

E、There is not enough information to determine which ports are in the blocking state

  • D

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