For the circuit shown below, the knee current of the ideal Zener diode is $\text{10 mA}.$ To maintain $5 V$ across $R_L$, the minimum value of the load resistor $R_L$ in $\Omega$ and the minimum power rating of the Zener diode in mW, respectively, are
- $\text{125 and 125}$
- $\text{125 and 250}$
- $\text{250 and 125}$
- $\text{250 and 250}$