Mr. Todd, a 75-year-old patient, underwent restaging for lung cancer (solid tumor) and is considered to have stage IV disease. The treatment team talked to the patient and his family extensively about experimental treatment options. The patient is refusing treatment. Mr. Todd’s nurse is honoring his decision to refuse further treatment and is requesting a consultation for hospice. When the nurse respects a patient’s wish to refuse treatment, it is an example of which bioethical principle?