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Which wave from ECG waveforms becomes widened when the self-triggering impulse does not arrive through the AV node?

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Which wave from ECG waveforms becomes widened when the self-triggering impulse does not arrive through the AV node?

(a) P wave

(b) QRS wave

(c) ST wave

(d) T wave

I had been asked this question in class test.

My question is based upon Video Printers topic in section Recording System of Biomedical Instrumentation

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The correct choice is (b) QRS wave

To elaborate: Sometimes irritation occurs in the ventricles, the self-triggering impulse does not arrive through the node and thus travels a different and slower path in spreading over the ventricles. The QRS wave then becomes widened and is classified as a ventricular ectopic beat.

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