A 74-year-old man on warfarin for atrial fibrillation presents with massive gastrointestinal haemorrhage and haemodynamic instability. His INR is 4.5. According to best practice, what is the most appropriate reversal strategy?AStop warfarin only and observeBAdminister vitamin K orally onlyCAdminister intravenous vitamin K and four-factor prothrombin complex concentrateDAdminister fresh frozen plasma aloneEGive platelet transfusion onlyCheck my answer