A Patient Reports Heart Palpitation but No Other Symptoms and Has

A patient reports heart palpitation but no other symptoms and has no prior history of cardiovascular disease. The clinic provider performs an electrocardiogram and notes atrial fibrillation and a heart rate of 120 beats per minute. Which is the initial course of action in treating this patient?

A) Administer atenolol intravenously.
B) Admit to the hospital for urgent cardioversion.
C) Refer the patient to a cardiologist.
D) Initiate steps to begin anticoagulant therapy.