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Consider the circuit shown in the figure with input $V(t)$ in volts. The sinusoidal steady state current $I(t)$ flowing through the circuit is shown graphically (where $t$ is in seconds). The circuit element $Z$ can be ____________.

1. a capacitor of $1 \; \text{F}$
2. an inductor of $1 \; \text{H}$
3. a capacitor of $\sqrt{3} \; \text{F}$
4. an inductor of $\sqrt{3} \; \text{H}$