Discussion
What is crossover distortion?
Answer: C
Near the zero crossing neither device conducts, because each needs a junction drop before it turns on, so a flat step appears in the output waveform. Saturation clips the peaks instead, supply sag compresses the whole waveform, and core distortion is a transformer effect. Crossover is worst at small signals, where the step is a large fraction of the output, which is the reverse of most distortion mechanisms and is why it is so audible. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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