When using a transcutaneous temporary pacemaker, the energy level should be set at:

A. the highest milliampere setting the patient can tolerate.

B. 10% above the milliampere needed for consistent capture of the myocardium.

C. a milliampere setting midway between the setting that causes capture of the myocardium and the setting at which symptoms first appear.

D. the milliampere setting that provides a heart rate of 80 bpm.