28歳の患者が36時間にわたって嘔吐と水様性下痢を呈しています。意識は清明で、粘膜は湿潤しており、皮膚ツルゴールは正常です。バイタルサイン：体温37.2°C（99°F）、心拍数88/分、血圧118/74 mm Hg。患者は口渇を訴えますが、嘔吐せずに少量ずつ飲むことができます。看護師はどの__0__を__1__すべきですか？

A 28-year-old client has had vomiting and watery diarrhea for 36 hours. The client is alert, mucous membranes are moist, and skin turgor is normal. Vital signs: temperature 37.2°C (99°F), heart rate 88/min, blood pressure 118/74 mm Hg. The client reports feeling thirsty but can drink small sips without vomiting. Which ::선택::actionassessmentmedicationintervention should the nurse take ::선택::encourage oral rehydration solution in small, frequent sipsinitiate intravenous 0.9% sodium chloride at 100 mL/houradminister ondansetron 4 mg orally as prescribedobtain a stat basic metabolic panel?