Discussion
Image rejection must be provided
Answer: B
Only filtering ahead of the mixer can help, because after mixing the image and the wanted signal occupy the same frequency and no filter can distinguish them. That is the argument for a tuned radio-frequency stage, and for choosing an intermediate frequency high enough to put the image far from the wanted signal. Every later stage is too late. This irreversibility is the same principle as anti-alias filtering before a sampler.
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