In order to obtain a 12-V stabilized supply from the current

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In order to obtain a 12-V stabilized supply from the current shown in figure below, the input to terminals A and B should be:

1. Less than 12 V with terminal A positive with respect to terminal B.
2. Greater than 12 V with B positive with respect to A.
3. Less than 12 V with A negative with respect to B.
4. Greater than 12 V with A positive with respect to B.

Correct Option: D

Input voltage should be greater than 12 V to allow for drop across R. Since Zener diode always work in reverse - biased mode. Terminal A should obviously, be positive.