Which of the Following Statements Best Describes an Atrioventricular Pacemaker

Which of the following statements best describes an atrioventricular pacemaker?

A) It stimulates the atria when the conduction system from the AV node through the ventricles is intact and functioning.
B) It mimics the normal cardiac conduction system and allows the atria to contract completely before the ventricles to allow for an atrial kick.
C) It stimulates both ventricles to contract, in contrast to ventricular pacing, in which only the lower portion of the right ventricle is stimulated.
D) It delivers direct stimulation to the ventricles to produce both atrial and ventricular contraction.