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What is not related to a transistorized series regulator?

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What is not related to a transistorized series regulator?

(a) The output can be varied by using a variable resistor

(b) The output is independent of temperature

(c) The overload and short circuit protection is not required

(d) The circuit has negative feedback responsible for regulation

I got this question in an interview for internship.

This intriguing question originated from Voltage Regulators in portion Regulators of Analog Circuits

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Correct choice is (c) The overload and short circuit protection is not required

To explain I would say: In a transistorized series regulator, the Zener diode maintains emitter voltage. An increase in output is canceled by a decrease in the output. The circuit has negative feedback for this regulation. The output may be varied by using a variable resistor and change in output due to temperature due to the Zener diode is canceled by the change in VBE of the transistor. However, when the load is reduced, or an accidental short-circuit occurs, overload and a short circuit occurs, and protection is needed to prevent that.

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