The response has unit magnitude and phase passing through −90° at 10⁴ rad/s, identifying the first-order all-pass H(s)=(a−s)/(a+s), a=10⁴ s⁻¹. For a unit step, y(t)=1−2e⁻ᵃᵗ. Setting y=0 gives t=ln2/a=100ln2 μs, A.
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