$\text { Use the graph of the function } y = \frac { x ^ { 3 } } { 4 } - 3 x \text { given below to estimate the open }$

$\text { Use the graph of the function } y = \frac { x ^ { 3 } } { 4 } - 3 x \text { given below to estimate the open }$ intervals on which the function is increasing or decreasing.

A) increasing on $( - \infty , - 2 )$ and $( 2 , \infty )$ ; decreasing on $( 2,2 )$
B) increasing on $( - \infty , - 2 )$ and $( 2 , \infty )$ ; decreasing on $( - 2,2 )$
C) increasing on $( - 2,2 )$ ; decreasing on $( - \infty , - 2 )$ and $( 2 , \infty )$
D) increasing on $( - 2 , - 2 )$ and $( 2 , \infty )$ ; decreasing on $( - 2 , - 2 )$
E) increasing on $( - \infty , 2 )$ and $( 2 , \infty )$ ; decreasing on $( - 2 , \infty )$