The graph of the function f(x) = (x + 2)(x + 6) is shown below. which statement about the function is true?

a. the function is positive for all real values of x where x > –4.
b. the function is negative for all real values of x where –6 < x < –2.
c. the function is positive for all real values of x where x < –6 or x > –3.
d. the function is negative for all real values of x where x < –2.