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In the circuit shown, the switch $S$ is open for a long time and is closed at $t=0$. The current $i(t)$ for $t \geq 0$ is

1. $i(t)=0.5-0.125 e^{-1000} \mathrm{~A}$
2. $i(t)=1.5-0.125 e^{-1000} \mathrm{~A}$
3. $i(t)=0.5-0.5 e^{-1000} \mathrm{~A}$
4. $i(t)=0.375 e^{- 1000} \mathrm{~A}$