A nurse is interpreting the ECG strip of a client who has bradycardia. Which cardiac components should the nurse identify as the role of the P wave?

A. Early ventricular repolarization is represented by the T wave, not the P wave. B. The P wave represents atrial depolarization, which is the electrical activity that triggers the contraction of the atria. C. Slow repolarization of ventricular Purkinje fibers is represented by the T wave, not the P wave. D. Ventricular depolarization is represented by the QRS complex, not the P wave.