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In the figure shown, assume that all the capacitors are initially uncharged. If $V_i(t)=10 u(t)$ Volts, then $V_0(t)$ is given by

1. $8 e^{-0.004 t}$ Volts
2. $8\left(1-e^{-0.004 t}\right)$ Volts
3. $8 u(t)$ Volts
4. $8$ Volts