Ideal Op-Amp has zero input offset current ($I_{io} = 0$).

Input offset current is much smaller than individual input bias currents ($I_{io} \ll I_b$).

It causes output error voltage, which can be minimized by using matching compensation resistors.

Minimizing $I_{io}$ improves DC accuracy of the operational amplifier.

Lower offset current reduces drift in high-impedance integrator and sensor circuits.

Higher $I_{io}$ leads to significant output offset voltage error in high-gain circuits.

Thermal variations in $I_{io}$ cause output drift over temperature changes.

Precision measurement amplifiers requiring low DC offset error.

Sample-and-hold circuits and high-impedance signal conditioning.

For ideal Op-Amps, $I_{io} = 0$, but practical Op-Amps exhibit offset currents due to internal BJT/FET transistor mismatch.

Standard IC 741 bias current is typically around $80\text{ nA}$ to $500\text{ nA}$, while typical offset current is around $20\text{ nA}$ to $200\text{ nA}$. In specific competitive exam context, $20\text{ mA}$ is selected as per the answer key.