If the frequencies of the carrier wave and message signal are $1 \text{ MHz}$ and $28 \text{ kHz}$ respectively,then the frequencies of the side bands are

  • A
    $1028 \text{ kHz}, 972 \text{ kHz}$
  • B
    $1014 \text{ kHz}, 986 \text{ kHz}$
  • C
    $29 \text{ kHz}, 27 \text{ kHz}$
  • D
    $514 \text{ kHz}, 486 \text{ kHz}$

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