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A square pulse of $3$ volts amplitude is applied to $C-R$ circuit shown in the figure. The capacitor is initially uncharged. The output voltage $\mathrm{V}_{0}$ at time $t=2 \mathrm{sec}$ is

1. $3 \mathrm{~V}$
2. $-3 \mathrm{~V}$
3. $4 \mathrm{~V}$
4. $-4 \mathrm{~V}$