Discussion
Assertion (A): Assertion: Aliasing cannot be removed by filtering after the sampler.
Reason (R): Reason: An aliased component occupies the same frequency as a genuine signal component.
Select the correct answer from the options below.
Answer: D
Both are true and the second is the reason for the first: once folded down, the alias is at a frequency the wanted signal also occupies and no filter can tell them apart. That is why the anti-alias filter must precede the sampler rather than follow it. The structure of the argument is identical to the receiver's image response, and recognising the shared shape saves learning the two facts separately.
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