单项选择题

当学生 A 用两台 Star-R2624 路由器在做路由器广域网口连通实验时误将本端路由器 V.35 线缆的插头插倒了。结果发现 ping 直连的路由器不通,请问此时查看本端路由器的状态应该是?

A.A、Serial 0 is up, line protocol is up
B.B、Serial 0 is up, line protocol is down
C.C、Serial 0 is down, line protocol is down
D.D、Serial 0 is down, line protocol is up
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