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In the derivation of expression for peak percent overshoot,

$M_{p}=\exp \left(\frac{-\pi \zeta}{\sqrt{1-\zeta^{2}}}\right) \times 100 \%$, which one of the following conditions is NOT required?

1. System is linear and time invariant.
2. The system transfer function has a pair of complex conjugate poles and no zeroes.
3. There is no transportation delay in the system.
4. The system has zero initial conditions.