Which line from the output of the show ip interface command indicates a layer 1 problem?

Which line from the output of the show ip interface command indicates a layer 1 problem?

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 down



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