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In the following circuit, the switch $\mathrm{S}$ is closed at $t=0$. The rate of change of current $\frac{d i}{d t}(0+)$ is given by

1. $0$
2. $\frac{R_{S} I_{S}}{L}$
3. $\frac{\left(R+R_{s}\right) I_{s}}{L}$
4. $\infty$