Discussion
Compared with full-carrier AM, DSB-SC transmission
Answer: A
Suppressing the carrier saves the two thirds of power it consumed, at the cost of requiring a coherent receiver because there is no longer an envelope that follows the message. Bandwidth is unchanged at twice the message frequency, since both sidebands remain. It uses less power, not more. And removing a sideband as well is single sideband, which is a further step.
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