The group delay function τ(ω) is related to phase function

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The group delay function τ(ω) is related to phase function φ(ω) as—

1. τ(ω) = dφ(ω)
  dω
2. τ(ω) = – d²φ(ω)
  dω²
3. τ(ω) = – d²φ(ω)
  dω²
4. τ(ω) = d²φ(ω)
  dω²

Correct Option: B

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