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Router R1 sits at the DCE side of the serial cable. The: show interfaces command says:
interface Serial1/0 is up, line protocol is down.
**Which of the following is the most likely issue here ? **

There is a hardware problem on the other end, and it must be fixed before you can communicate

The layer-2 protocol is down, most likely use: "`ppp enable`" or "`hdlc enable`"

Add clock rate interface configuration on the serial interface.

You have probably configured the same ip address on both ends and duplicate-ip-address-detection has shutdown the port in the err-disable status

Explanation

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