单选题Router# show interfaces serial 0/1 命令的输出显示了如下内容： Serial0/1 is down， line protocol is down. 线路协议为 down（关闭）的原因最可能是什么（）ASerial0/1 为关闭状态B路由器未连接电缆C远程路由器正在使用 serial 0/0 接口D尚未设置时钟频率
单选题
Router# show interfaces serial 0/1 命令的输出显示了如下内容： Serial0/1 is down， line protocol is down. 线路协议为 down（关闭）的原因最可能是什么（）
A
Serial0/1 为关闭状态
B
路由器未连接电缆
C
远程路由器正在使用 serial 0/0 接口
D
尚未设置时钟频率
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