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A function is matched below against an i...

A function is matched below against an interval where it is supposed to be increasing. Which of the following parts is incorrectly matched? Interval, Function
(a)(2, `oo)` , `2x^3-3x^2-12 x+6`
(b)`(-oo,oo)` , `x^3-3x^2+3x+3`
(c)`(-oo-4)` , `x^3+6x^2+6`
(d)`(-oo,1/3)` , `3x^2-2x+1`

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