Choose the correct statement about Zener diode:

We need to identify the correct statement about a Zener diode.

Key properties of a Zener diode:

In forward bias, a Zener diode behaves just like a normal p-n junction diode. It conducts current once the forward voltage exceeds the typical threshold (~0.7 V for silicon).

In reverse bias, a Zener diode is specifically designed to undergo controlled breakdown at a well-defined voltage called the Zener breakdown voltage. Once this voltage is reached, the voltage across the diode remains nearly constant even as current varies. This property makes it function as a voltage regulator in reverse bias.

Evaluating the options:

Option A: "It works as a voltage regulator in reverse bias and behaves like simple p-n junction diode in forward bias." This is correct.

Option B: "It works as a voltage regulator in both forward and reverse bias." This is incorrect — in forward bias it does not regulate voltage.

Option C: "It works as a voltage regulator only in forward bias." This is incorrect — it regulates voltage in reverse bias, not forward bias.

Option D: "It works as a voltage regulator in forward bias and behaves like simple p-n junction diode in reverse bias." This is incorrect — it reverses the actual behavior.

The correct answer is Option A.