A nurse is providing preoperative teaching to a patient who will soon undergo open heart surgery. The nurse's teaching plan includes exercises of the extremities.What is the purpose of teaching a patient leg exercises prior to surgery?

Leg exercises increase the patient's muscle mass postoperatively.

Leg exercises improve circulation and prevent venous thrombosis.

Leg exercises help to prevent pressure sores to the sacrum and heels.

Leg exercises help increase the patient's level of consciousness after surgery.