Discussion
Moving the carrier oscillator from one side of a fixed filter to the other
Answer: D
It switches the sideband, which is the standard economical way to offer both without a second filter: put the carrier below the filter passband for one sideband and above it for the other. Bandwidth is unchanged. Carrier suppression depends on modulator balance. And the recovered message polarity is not what changes, though the spectrum is inverted, which is why a receiver must select the matching sideband.
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