Let a and b be real numbers where a b0. Which of the following functions could represent the graph below?
f(x)= x(x - a)^3 (x - b) ^3
f(x)= (x - a) ^2 (x - b) ^4
f(x)= x(x - a) ^6 (x - b) ^2
f(x)= (x - a) ^5 (x - b)