Which one below is the most bandwidth efficient digital modulation?

Which one below is the most bandwidth efficient digital modulation?

  1. a) BPSK
  2. b) QPSK
  3. c) FSK
  4. d) 16QAM

From the BCS Technical Cadre (ICT) October 2025 – 49th BCS Written (Special) (BPSC) exam, question 57 of 106.

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