Solve the Inequality $$x ^ { 3 } + 4 x ^ { 2 } - 16 x \leq 64$$

Multiple Choice

Solve the inequality. Write the solution set in interval notation.
- $$x ^ { 3 } + 4 x ^ { 2 } - 16 x \leq 64$$

A) $[ - 4,4 ]$
B) $( - \infty , - 4 ] \cup [ 4 , \infty )$
C) $[ 4 , \infty )$
D) $( - \infty , 4 ]$