The figure above shows the graph of f', the derivative of a function f. The domain of f is the set of all real numbers x such that -3 < x < 5. a. For what values of x does f have a relative maxlmum? Why? b. On what intervals is the graph of concave upward? Use ' to justify your answer. C. Suppose that f(1) = 0. In the xy-plane provided, draw a sketch that shows the general shape of the graph of the function f on the open interval 0 < x < 2. у X O 2