A 77 year old man with permanent atrial fibrillation, hypertension and type 2 diabetes has no contraindications to anticoagulation. His CHA2DS2 VASc score is 4. What is the most appropriate strategy to reduce his stroke risk?AStart a direct oral anticoagulant such as ApixabanBStart aspirin 75 mg once dailyCNo antithrombotic therapy is requiredDStart dual antiplatelet therapy with aspirin and clopidogrelEStart prophylactic dose low molecular weight heparinCheck my answer