Let a and b be real numbers where a b 0. Which of the following functions could represent the graph below?
f(x) = x(x -a)2(x - b)4
f(x) = x(x - a)3(x - b)2
f(x) = 4(x-a)(x - b)2
f(x) = x2 (x-a)5 (x-b)