[单选] Which of the following is true about an OSPF area border router (ABR)?（）

A . The ABR must have multiple interfaces connected to the backbone areA
B . An ABR is a router with two interfaces, each connected to a different nonbackbone areA
C . The only requirement to be considered an ABR is at least one interface connected to the backbone areA
D . An ABR must have at least one interface in the backbone area plus at least one other interface in a nonbackbone areA

新农村建设的二十字方针是什么？手工注册搜索引擎《廉政准则》规定，不准在干部考察工作中隐瞒或者歪曲（）。事实真相。工作业绩。相关资料。现实表现。从拉伸试验如何获得常用的力学性能数据？ Refer to the exhibit. Which statement is true about the output？（） The port on switch CAT1 is forwarding and sending BPDUs correctly.。 The port on switch CAT1 is blocking and sending BPDUs correctly.。 The port on switch CAT2 is forwarding and receiving BPDUs correctly.。 The port on switch CAT2 is blocking and sending BPDUs correctly.。 The port on switch CAT3 is forwarding and receiving BPDUs correctly.。 The port on switch CAT3 is forwarding， sending， and receiving BPDUs correctly.。 Which of the following is true about an OSPF area border router (ABR)?（）

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[单选] Which of the following is true about an OSPF area border router (ABR)?（）

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