As per $IS \: 456:2000$, in the Limit State Design of a flexural member, the strain in reinforcing bars under tension at ultimate state should not be less than

1. $\dfrac{f_y}{E_s} \\$
2. $\dfrac{f_y}{E_s}+0.002 \\$
3. $\dfrac{f_y}{1.15E_s} \\$
4. $\dfrac{f_y}{1.15E_s}+0.002$