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A Zener diode in the circuit shown in the figure is has a knee current of $5 \mathrm{~mA}$, and a maximum allowed power dissipation of $300 \mathrm{~mW}$. What are the minimum and maximum load currents that can be drawn safely from the circuit, keeping the output voltage $\mathrm{V}_{\mathrm{o}}$ constant at $6 \mathrm{~V}$?

- $0 \mathrm{~mA}, 180 \mathrm{~mA}$
- $5 \mathrm{~mA}, 110 \mathrm{~mA}$
- $10 \mathrm{~mA}, 55 \mathrm{~mA}$
- $60 \mathrm{~mA}, 180 \mathrm{~mA}$