Solve the Inequality Below $x ^ { 3 } - 8 x ^ { 2 } + 9 x + 18 \leq 0$

Multiple Choice

Solve the inequality below. $x ^ { 3 } - 8 x ^ { 2 } + 9 x + 18 \leq 0$

A) $( - \infty , 3 ] \cup [ 6 , \infty )$
B) $( - \infty , - 1 ] \cup [ 6 , \infty )$
C) $( - \infty , - 1 ] \cup [ 3,6 ]$
D) $[ - 1,3 ] \cup [ 6 , \infty )$
E) $( - \infty , - 1 ] \cup [ 3 , \infty )$