Solve the Inequality $x ^ { 2 } - 6 x \leq - 8$

Multiple Choice

Solve the inequality. Write the solution set in interval notation.
- $x ^ { 2 } - 6 x \leq - 8$

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