The Opal Health Plan complies with all of the provisions of the Newborns' and Mothers' Health Protection Act of 1996 (NMHPA). Samantha Hill and Debra Chao are Opal enrollees. Ms. Hill was hospitalized for a cesarean birth, and Ms. Chao was hospitalized for a normal delivery. From the following answer choices, select the response that indicates the minimum hospital stay for which Opal, under NMHPA, must provide benefits for Ms. Hill and Ms. Chao.