The graph of the function f(x) = –(x + 6)(x + 2) is shown below. On a coordinate plane, a parabola opens down. It goes through (negative 6, 0), has a vertex at (negative 4, 4), and goes through (negative 2, 0). Which statement about the function is true?

aThe function is increasing for all real values of x where x < –4.

bThe function is increasing for all real values of x where –6 < x < –2.

c The function is decreasing for all real values of x where x < –6 and where x > –2.

d The function is decreasing for all real values of x where x < –4.