当在ZSR路由器上手动的shut down fei_1/1后，再show interface fei_1/1，结果是
A.fei_1/1 is administratively down，line protocol is up B.fei_1/1 is up,line protocol is down C.fei_1/1 is administraticely down,line protocol is down D.fei_1/1 is down,line protocol is down正确答案C
