A 64-year-old man presents with melaena, tachycardia and postural hypotension. He is a regular NSAID user. Which is the most appropriate initial management step in the emergency department?AArrange urgent outpatient endoscopy the next dayBStart oral omeprazole and dischargeCResuscitate with IV fluids, insert two large-bore IV cannulas and commence IV proton pump inhibitorDGive intramuscular vitamin K onlyEPerform digital rectal examination only and observeCheck my answer