$A$ Zener diode with $5\ V$ Zener voltage is used to regulate an unregulated $DC$ voltage input of $25\ V$. For a $400\ \Omega$ resistor connected in series, the Zener current is found to be $4$ times the load current. The load current $(I_L)$ and load resistance $(R_L)$ are:
- A$I_L = 20\ mA; R_L = 250\ \Omega$
- B$I_L = 10\ A; R_L = 0.5\ \Omega$
- C$I_L = 0.02\ mA; R_L = 250\ \Omega$
- D$I_L = 10\ mA; R_L = 500\ \Omega$
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