A voltage regulator is a circuit which:

smoothed the AC variation in DC output voltage.

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converts the AC voltage to DC voltage.

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maintains constant DC output voltage despite fluctuating AC.

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none of the above.

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Solution

The correct option is C maintains constant DC output voltage despite fluctuating AC.
Zener diode efficiently works as a voltage regulator in a circuit, which maintains constant DC output voltage despite fluctuating AC. Zener voltage remains constant even though the current through the Zener diode changes.

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