A Permanent Pacemaker Is a Medical Device

A permanent pacemaker is a medical device:

A) in which electrode pads are applied to the surface of the patient's chest.
B) in which an electrode is placed in contact with the ventricular epicardium.
C) that is external to the body and an electrode is fed through a vein into the right atrium or right ventricle.
D) Implanted in a surgically created pocket beneath the skin in the patient's chest just below the clavicle.