The doctor has ordered a Transcutaneous Electrical Nerve Stimulation (TENS) unit for the client with chronic back pain. The nurse teaching the client with a TENS unit should tell the client:

C The unit may be used anywhere on the body without fear of adverse reactions.' A You may be electrocuted if you use water with this unit.' D A cream should be applied to the skin before applying the unit.' B Please report skin irritation to the doctor.'