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In the figure shown, the capacitor is initially uncharged. Which one of the following expressions describes the current $I(t)$ (in mA) for $t > 0$?

1. $I(t)= \frac{5}{3}(1-e^{-t/ \tau}), \tau= \frac{2}{3} \text{msec} \\$
2. $I(t)= \frac{5}{2}(1-e^{-t/\tau}), \tau= \frac{2}{3} \text{msec} \\$
3. $I(t)= \frac{5}{3}(1-e^{-t/\tau}), \tau= 3 \text{msec} \\$
4. $I(t)= \frac{5}{2}(1-e^{-t/\tau}), \tau= 3 \text{msec}$

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