Locate the critical points of the following function. Then use the Second Derivative Test to determine whether they correspond to local maxima or local minima, or if the test is inconclusive. f ( x ) = -x4 - 2x3 - 18x2 +216x Identify all the critical points that are local minima by the Second Derivative Test. Select the correct choice below and fill in any answer boxes within your choice. O A. x= O B. There are no critical points that are local minima according to the Second Derivative Test