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For a bit-rate of $8 \; \mathrm{kbps}$, the best possible values of the transmitted frequencies in a coherent binary FSK system are

  1. $16 \; \mathrm{kHz}$ and $20 \; \mathrm{kHz}$
  2. $20 \; \mathrm{kHz}$ and $32 \; \mathrm{kHz}$
  3. $20 \; \mathrm{kHz}$ and $40 \; \mathrm{kHz}$
  4. $32 \; \mathrm{kHz}$ and $40 \; \mathrm{kHz}$
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