A nurse is caring for a client who has a prescription for a continuous passive motion (CPM) machine following a total knee arthroplasty. Which of the following actions should the nurse take?

C Apply a cold pack to the knee while using the CPM machine. D Ensure the client's knee is extended fully during CPM use. B Keep the client's knee in the CPM machine for 2 hours daily. A Set the CPM machine to flex the knee to 90 degrees on the first day.