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f:R rarrR defined by f(x)=x^(3)+x^(2)-x-...

`f:R rarrR` defined by `f(x)=x^(3)+x^(2)-x-1.` Then the inverse image set of `{0}` is

A

`{0}`

B

`{1, 0, -1}`

C

`{0, -1}`

D

`{1, -1}`

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