Discussion
A balanced modulator is used to generate
Answer: D
The balance cancels the carrier at the output, leaving the two sidebands only, which is DSB-SC and the first stage in generating single sideband. Full carrier requires the carrier to be deliberately added. Frequency modulation needs a reactance or phase modulator instead. And vestigial sideband still requires a shaping filter after the modulator, so the last option is incomplete rather than merely wrong.
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