Discussion
What happens if a signal is sampled below its Nyquist rate?
Answer: A
Under-sampling folds components above half the rate down into the baseband, where they sit on top of the wanted signal. Sample amplitudes are unaffected, and so is the average power. And the reconstruction filter would need to be narrower rather than wider. The damage is done at the moment of sampling, which is why the sampling rate and the anti-alias filter must be settled together as one decision.
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