Find the critical points, domain endpoints, and local extreme values for the function. y=x (x+3) What is/are the critical point(s) or domain endpoint(s) where f is undefined? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The critical point(s) or domain endpoint(s) where f' is undefined is/are at x = (Type an integer or a simplified fraction. Use a comma to separate answers as needed.) O B. There are no critical points or domain endpoints where f' is undefined