[单选]
Refer to the exhibit. Which statement is true about the output？（）

A . The port on switch CAT1 is forwarding and sending BPDUs correctly.
B . The port on switch CAT1 is blocking and sending BPDUs correctly.
C . The port on switch CAT2 is forwarding and receiving BPDUs correctly.
D . The port on switch CAT2 is blocking and sending BPDUs correctly.
E . The port on switch CAT3 is forwarding and receiving BPDUs correctly.
F . The port on switch CAT3 is forwarding， sending， and receiving BPDUs correctly.

处理皮带机打滑时，两次启动皮带机的时间间隔不小于（）秒。 10。 30。 60。 Which of the following is true about an OSPF area border router (ABR)?（） The ABR must have multiple interfaces connected to the backbone areA。 An ABR is a router with two interfaces, each connected to a different nonbackbone areA。 The only requirement to be considered an ABR is at least one interface connected to the backbone areA。 An ABR must have at least one interface in the backbone area plus at least one other interface in a nonbackbone areA。什么是FTP服务？FTP服务器有什么用处？存在主义股份公司的重整

Refer to the exhibit. Which statement is true about the output？（）

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[单选] Refer to the exhibit. Which statement is true about the output？（）

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[单选]
Refer to the exhibit. Which statement is true about the output？（）