【单选题】
Refer to the exhibit. In the diagram， the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state？（）<br /> <img src="https://nimg.ppkao.com/2018-07/yiyu/2018072317300046507.jpg?sign=3c7f2a98e55a41bead751b43cdd9b39e&t=62d4b370" />
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.
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