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If a FET has a pinch off voltage =-1V and ID=1mA, If Vgs=0V, What is the value of IDSS?

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If a FET has a pinch off voltage =-1V and ID=1mA, If Vgs=0V, What is the value of IDSS?

(a) 1A

(b) 1mA

(c) 0A

(d) 100mA

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This is a very interesting question from The Pinch off Voltage Vp in portion Field-Effect Transistors of Electronic Devices & Circuits

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Right choice is (b) 1mA

To explain I would say: ID=IDSS (1-Vgs/Vp)^2

Vgs=0V => : ID=IDSS=1mA.

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