Solve the Quadratic Inequality $$x ^ { 2 } - 7 x + 12 \geq 0$$

Multiple Choice

Solve the quadratic inequality. Write the solution set in interval notation.
- $$x ^ { 2 } - 7 x + 12 \geq 0$$

A) $[ 3,4 ]$
B) $( - \infty , 3 ]$
C) $[ 4 , \infty )$
D) $( - \infty , 3 ] \cup [ 4 , \infty )$