ECG shows atrial fibrillation

A 66-year-old man has presented to the emergency department with a stroke. CT shows no haemorrhage.
ECG shows atrial fibrillation. He has been thrombolysed and he is awaiting discharge. He has no other
medical conditions. What is the SINGLE best prophylactic regimen for him?
A.
Warfarin
B.
Heparin
C.
Aspirin
D.
Statins
E.
Beta blockers