A linear phase channel with phase delay τp and group delay

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A linear phase channel with phase delay τp and group delay τg must have—

1. τ_p = τ_g = Constant
2. τ_p ∝ f and τ_g ∝ f
3. τ_p = constant and τ_g ∝ f
4. τ_p ∝ f and τ_g = constant (f denotes frequency)

Correct Option: D

For a linear phase channel phase delay should be directly proportional to the frequency and group delay should be constant.
Here alternative (D) is the correct choice