Discussion
An anti-aliasing filter is placed
Answer: A
It must come before the sampler, because once the spectrum has folded no later filter can unfold it. A filter after the sampler cannot distinguish an alias from a genuine component, since they occupy the same frequency. Placing it after the quantiser is later still. A reconstruction filter is also needed at the output, but that is a separate device with a different job: removing the images the sampling process created.
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