【单项选择题】
Refer to the exhibit. Which statement is true about the output？（）<br /> <img src="https://img.ppkao.com/2018-07/gelingxia/2018073109254190858.jpg" /><p> Refer to the exhibit. Which statement is true about the output？（）<br /> <img src="https://img.ppkao.com/2018-07/gelingxia/2018073109254190858.jpg" /></p>
A、A.The port on switch CAT1 is forwarding and sending BPDUs correctly.
B、B.The port on switch CAT1 is blocking and sending BPDUs correctly.
C、C.The port on switch CAT2 is forwarding and receiving BPDUs correctly.
D、D.The port on switch CAT2 is blocking and sending BPDUs correctly.
E、E.The port on switch CAT3 is forwarding and receiving BPDUs correctly.
F、F.The port on switch CAT3 is forwarding， sending， and receiving BPDUs correctly.
查看正确答案
