The correct answer is C.
OBJ-5.2: Since the scenario states the VoIP phone works properly from the old desk, it is properly configured and the hardware itself works. This indicates the problem must be caused by the new desk which contains a different network cable from the switch to the wall jack in the cubicle. This is most likely a bad cable, such as one with a short in it. To verify this theory, the technician should use a cable tester to verify if the cable does have a short or not. While attenuation is a possible cause of the problem described, it is unlikely since the employee only moved a few desks (10-15 feet), and is not a large enough distance to cause significant attenuation issues./span>