Ivabrandine Selectively Blocks I_f Channels in the Heart

Ivabrandine selectively blocks I_f channels in the heart.Which statement would be true concerning a patient who is taking this drug?

A) The drug would slow down this individual's heart rate.
B) This patient must have been suffering from bradycardia.
C) This drug would decrease contractility of the patient's heart.
D) This drug would raise the blood pressure of the patient.
E) The amount of calcium entering the patient's heart cells would increase.