A 58-year-old man presents to the Emergency Department following an episode of transient right-sided weakness which lasted approximately 20 minutes.. Aspirin 300mg od

A 58-year-old man presents to the Emergency Department following an episode of transient right-sided weakness which lasted approximately 20 minutes. He has had two previous episodes of a similar nature. On examination he is found to be in atrial fibrillation at a rate of 80 bpm CT head normal
What is the most suitable immediate management?
A.A Digoxin
B.A Aspirin 300mg od + dipyridamole 200mg bd
C.A Aspirin 300mg od***
D.A Sotalol
E.A Warfarin