In the circuit shown below, the knee current of the ideal Zener diode is $10$ $mA$. To maintain $5$ $V$
across $R_L$ minimum value of $R_L$ in $\Omega$ and the minimum power rating of the Zener diode in $mW$
respectively are

1. $125$ and $125$
2. $125$ and $250$
3. $250$ and $125$
4. $250$ and $250$

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