Using the First Derivative Test, what are the local extrema for the function h(x) = 3x3-9x2-72x + 9? Select the correct answer below: There is a local minimum at x = 4. There are no local extrema. There is a local maximum at a = -2 and a local minimum at x = 4. There is a local minimum at x= -2 and a local maximum at a = = 4. There is a local maximum at a = -2 and a local maximum at a = 4.