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Assuming $\mathrm{V}_{\text {CEsat }}=0.2 \mathrm{~V}$ and $\beta=50$, the minimum base current $\left(I_{v}\right)$ required to drive the transistor in the given figure to saturation is

1. $56 \; \mu \mathrm{A}$
2. $140 \mathrm{~mA}$
3. $60 \mu \mathrm{A}$
4. $3 \; \mathrm{~mA}$