What is the procedure for locating absolute maximum and minimum values on a closed bounded domain R? Select the correct choice below. A. Determine the values of the function at all critical points of R. The greatest of these values is the absolute maximum on R, and the least of these is the absolute minimum. B. Determine the values of the function at all critical points in R. Then find the maximum and minimum values on the boundary of R. The greatest of these values is the absolute maximum on R, and the least of these is the absolute minimum. C. Because the absolute extreme values always occur on the boundary, find the maximum and minimum values of the function on the boundary of R. D. A continuous function on a closed bounded domain may not have absolute extreme values.