Solve the Polynomial Inequality $$x ^ { 4 } - 6 x ^ { 3 } - 60 x ^ { 2 } + 152 x + 480 \leq 0$$

Multiple Choice

Solve the polynomial inequality.
- $$x ^ { 4 } - 6 x ^ { 3 } - 60 x ^ { 2 } + 152 x + 480 \leq 0$$

A) $[ - 6,10 ]$
B) $[ - 6 , - 2 ] \cup [ 4,10 ]$
C) $( - 6 , - 2 ) \cup [ 4,10 ]$
D) $[ - 6 , - 2 ] \cup ( 4,10 )$