A 64-year-old man with a history of peptic ulcer disease presents with melaena and presyncope. Blood pressure is 90/60 mmHg and heart rate 110 beats/min. What is the most appropriate initial management step?AArrange urgent endoscopy without other interventionsBAdminister high-dose intravenous proton pump inhibitor and schedule endoscopy after stabilisationCStart oral proton pump inhibitor and dischargeDBegin aggressive resuscitation with large-bore intravenous access and crystalloidsEGive immediate packed red blood cell transfusion without fluidsCheck my answer