(1 point) Consider the function z = x7y+ 14x6 - 128y. Find and classify all critical points of the function. If there are more blanks than critical points, leave the remaining entries blank. The critical point with the smallest x-coordinate is ) Classification: ) (local minimum, local maximum, saddle point, cannot be determined) The critical point with the next smallest x-coordinate is ) Classification: cannot be determined) (local minimum, local maximum, saddle point,