After issuing the show interfaces terse command, you notice that the status of one interface is "up down". What does this indicate?"()
A、A.Layer 1 on the interface is up but Layer 2 is down.
B、B.Layer 2 on the interface is up but Layer 3 has not been configured.
C、C.The interface is administratively up but the link status is down.
D、D.The interface is up but has been administratively turned off.