A group of nurses is reviewing several electrocardiograms (ECGs). The students demonstrate an understanding of the waveforms when they identify which component as indicating ventricular repolarization (relaxation).

A. T wave: The T wave represents ventricular repolarization (relaxation), indicating the end of the ventricular contraction phase. B. QRS complex: The QRS complex represents ventricular depolarization (contraction), not repolarization. C. P wave: The P wave represents atrial depolarization, not ventricular repolarization. D. ST segment: The ST segment represents the time between ventricular depolarization and repolarization, but it is not the waveform indicating repolarization itself.