The transfer function of a system is $\mathrm{G}(s)=\frac{100}{(s+1)(s+100)}$. For a unit-step input to the system the approximate settling time for $2 \%$ criterion is
- $100 \; \mathrm{sec}$
- $4 \; \mathrm{sec}$
- $1 \; \mathrm{sec}$
- $0.01 \; \mathrm{sec}$