After issuing the show interfaces terse command, you notice that the status of one interface is "up down". What does this indicate?"（）

A、Layer 1 on the interface is up but Layer 2 is down.

B、Layer 2 on the interface is up but Layer 3 has not been configured.

C、The interface is administratively up but the link status is down.

D、The interface is up but has been administratively turned off.