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To use FET as a voltage controlled resistor, in which region it should operate?

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To use FET as a voltage controlled resistor, in which region it should operate?

(a) Ohmic region

(b) cut off

(c) Saturation

(d) cut off and saturation

I had been asked this question in a national level competition.

Question is taken from The Junction Field-Effect Transistor in portion Field-Effect Transistors of Electronic Devices & Circuits

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Right choice is (a) Ohmic region

Explanation: By varying the gate to source voltage, Resistance can be varied as follows rd = ro/(1-Vgs/Vp)^2

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