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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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