Find the Intervals of Increase and Decrease For $f ( x ) = 6 x ^ { 3 } + 9 x ^ { 2 } - 108 x - 3$

Multiple Choice

Find the intervals of increase and decrease for $f ( x ) = 6 x ^ { 3 } + 9 x ^ { 2 } - 108 x - 3$ .

A) Increasing on x < -3 and x > 2,decreasing on -3 < x < 2
B) Increasing on -3 < x < 2,decreasing on x < -3 and x > 2
C) Increasing on x < -2,decreasing on x > 3
D) Increasing on x $\leq$ -2 and x $\geq$ 3 ,decreasing on - 2 $\leq$ x $\leq$ 3