如果路由器的接口没有连接串行线缆，但其他信息都已经正确并且激活了该接口，下列哪项接口信息状态是正确的？（）

A.Serial0/0/0 is administratively down,line protocol is down
B.Serial0/0/0 is down,line protocol is down
C.Serial0/0/0 is up,line protocol is up
D.Serial0/0/0 is up,line protocol is down