A 26-year-old male presents with abdominal pain, diarrhea, and vomiting for 1 day, after consuming seafood the previous day. The abdominal pain is not accompanied by tenesmus, with over 10 watery bowel movements per day. No history of chronic diarrhea, drug allergies, or exposure to epidemic areas. Physical exam: T36.7°C, P105/min, weak and thready pulse, BP 75/50 mmHg, alert, sunken orbits, no rash or petechiae, non-icteric sclera, mild lower abdominal tenderness without rebound or guarding, active bowel sounds. 24-hour urine output is 400ml. Based on symptoms, plasma specific gravity, and urine output, which 24-hour fluid replacement regimen is correct?