A customer states that the speakers in the kitchen are not working. Which of the following are the correct steps that an integrator should follow to troubleshoot this problem?

A.
Make sure the power is turned on, set volume to high and replace the volume control.

B.
Make sure all components have power, use a multi-meter to check for resistance, and replace one speaker.

C.
Replace the volume control, run a new wire to the kitchen and set volume to high.

D.
Make sure all components have power, check all connections, and swap speaker wires from a known working channel.