Why Would Someone Need to Have an Artificial Pacemaker Installed

Why would someone need to have an artificial pacemaker installed in his or her heart tissue?

A) The heart valves are not directing blood flow through the chambers properly.
B) The AV node is not sending signals to the ventricles.
C) The SA node is not functioning properly to generate action potential at the proper intervals.
D) The Purkinje fibers are not distributing the signal properly.

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