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When is a regulator used?

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When is a regulator used?

(a) when there are small variations in load current and input voltage

(b) when there are large variations in load current and input voltage

(c) when there are no variations in load current and input voltage

(d) when there are small variations in load current and large variations in input voltage

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I'd like to ask this question from Voltage Regulation Using Zener Diode in portion Application of Diodes of Electronic Devices & Circuits

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Correct choice is (a) when there are small variations in load current and input voltage

For explanation: The regulator has following limitations: 1.It has low efficiency for heavy load currents 2. The output voltage changes slightly due to Zener impedance. Hence, it is used when there are small variations in load current and input voltage.

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