A 75-year-old woman presents to the emergency department with melena and light-headedness. Her heart rate is 112 beats/min, blood pressure 86/54 mm Hg, and she appears pale and diaphoretic. What is the most appropriate initial management step?AArrange urgent upper endoscopy within 24 hours without resuscitationBStart high-dose oral proton pump inhibitor therapy and dischargeCBegin aggressive intravenous crystalloid resuscitation and activate a massive transfusion protocol if neededDAdminister intramuscular Adrenaline and observe for responseEGive prophylactic antibiotics onlyCheck my answer