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The physical point-to-point connection of two routers is working fine, but there is a communication failure. After following the correct troubleshooting steps, a possible timer or encapsulation mismatch issue is found.
If our solution fixed the problem, what would be the output if the command: "show interface serial0" is issued?

serial0 is up, line protocol is up.

serial0 is up, line protocol is down.

serial0 is down, line protocol is down.

serial0 is down, line protocol is up.

Explanation

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