A 65-year-old man presents with melena and postural dizziness. BP is 90/60 mmHg, pulse 110 beats/min. What is the most appropriate immediate management step in the emergency department?AArrange urgent upper endoscopy before any other interventionBStart high-dose proton pump inhibitor infusion onlyCInsert at least one large-bore intravenous cannula and begin fluid resuscitationDAdminister oral iron supplementationEDischarge with outpatient gastroscopy bookingCheck my answer