[单选] Which line from the output of the show ip interface command indicates a layer 1 problem?()
A . Serial0/1 is up, line protocol is down B . Serial0/1 is down, line protocol is down C . Serial0/1 is up, line protocol is up D . Serial0/1 is administratively down, line protocol is dow
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Which line from the output of the show ip interface command indicates a layer 1 problem?()