Discussion
Differentiating a message before a frequency modulator yields
Answer: A
The dual operation gives phase modulation: differentiating undoes the integration that the frequency-to-phase relationship performs. The pair of conversions is why the two schemes are studied together and why either modulator can produce either signal with the right pre-processing. Wideband FM would need more deviation rather than differentiation. And the two amplitude schemes named cannot be reached from an angle modulator at all.
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