A function is matched below against an interval where it is supposed to be increasing. Which of the following pairs is incorrectly matched?

Question

Interval	Function
(- $\infty $, $\infty $)	x³ - 3x² + 3x + 3

Interval	Function
[2, $\infty $)	2x³ - 3x² - 12x + 6

Interval	Function
$\left( { - \infty ,{1 \over 3}} \right]$	3x² - 2x + 1

Interval	Function
($ - \infty $, - 4 )	x³ + 6x² + 6

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