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Consider the constant current source shown in the figure below. Let $\beta$ represent the current gain of the transistor.

The load current $I_0$ through $R_L$ is

1. $I_0 = \bigg( \frac{\beta+1}{\beta} \bigg) \frac{V_{ref}}{R}$
2. $I_0 = \bigg(\frac{\beta}{\beta+1}\bigg) \frac{V_{ref}}{R}$
3. $I_0=\bigg (\frac{\beta+1}{\beta} \bigg ) \frac{V_{ref}}{2R}$
4. $I_0 = \bigg (\frac{\beta}{\beta+1} \bigg) \frac{V_{ref}}{2R}$