单选题PPP链路的状态为serial number is administratively down，line protocol is down时，说明（）。A物理链路有问题B接口被管理员shutdown了C参数配置不正确D没大问题，重启路由器就行了
单选题
PPP链路的状态为serial number is administratively down，line protocol is down时，说明（）。
A
物理链路有问题
B
接口被管理员shutdown了
C
参数配置不正确
D
没大问题，重启路由器就行了
参考解析
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