Discussion
What is the effect of relying on clipping to limit amplitude?
Answer: B
Clipping holds the amplitude by flattening the waveform's peaks, so the output is no longer a sine and carries strong odd harmonics. It is perfectly acceptable where a squarewave or a clock is wanted and unacceptable in a signal generator. Frequency does shift a little with supply, but that is a separate mechanism. The choice of limiting mechanism is the choice of output purity, and it is decided by what the oscillator is for rather than by any theoretical consideration.
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