A 54-year-old man presents with haematemesis and melaena. He is hypotensive and tachycardic but conscious. What is the single most important immediate management step?AUrgent upper GI endoscopy in outpatientsBResuscitation with ABC approach including large-bore IV access and fluid resuscitationCImmediate oral Omeprazole and dischargeDRoutine iron supplementationEBarium swallow study to identify sourceCheck my answer