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In the silicon BJT circuit shown below, assume that the emitter area of transistor $\text{Q1}$ is half that of transistor $\text{Q2.}$

The value of current $I_0$ is approximately

1. $0.5 \mathrm{~mA}$
2. $2 \mathrm{~mA}$
3. $9.3 \mathrm{~mA}$
4. $15 \mathrm{~mA}$