What does the term "harmonic distortion" refer to?

A) The loss of signal during transmission

B) The introduction of new frequencies at harmonics of the input frequency

C) The filtering of a signal

D) The delay in signal processing

Answer: B) The introduction of new frequencies at harmonics of the input frequency

Explanation: Harmonic distortion occurs when a system introduces additional frequencies that are harmonics of the input frequency, often resulting in unwanted changes to the waveform and affecting signal quality.