[单选]
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

《服务质量规范》规定：重点旅客：指老、幼、病、残、孕旅客。特殊重点旅客是指依靠辅助器具才能行动等需特殊照顾的重点旅客。（）氮的溶解形式及对焊接质量的影响？《服务质量规范》空调列车规定：夜间作业、行走、交谈、开关门要轻。进包房先敲门，出包房时，转身离开。（）钢缆输送机司修工应做到哪“三知、四会、五严格”？避免胶带或钢丝绳脱槽的方法是什么？

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

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[单选] Refer to the exhibit. In the diagram, the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state?（）

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[单选]
Refer to the exhibit. In the diagram, the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state?（）