A Difference Between Dofetilide and Ibutilide Is That

A difference between dofetilide and ibutilide is that:

A) dofetilide acts by blocking sodium channels, whereas ibutilide acts by blocking potassium channels.
B) dofetilide is administered orally, whereas ibutilide is administered intravenously.
C) dofetilide is indicated for the treatment of atrial flutters, whereas ibutilide is indicated for the treatment of atrial fibrillation.
D) dofetilide is a Class 2 antiarrhythmic drug, whereas ibutilide is a Class 4 antiarrhythmic drug.