Consider the function, whose graph y = f(a) is shown below. -2 What is the set of values of a E (-3, 3) for which the derivative f' (x) exists? O (-3, -2) U ( - 2, 2) U (2, 3) O (-3,3) \\ {-2, 0,2} O [-3, 3] \\ {-2, 2} O {-2, 0, 2}