Solve part c

28. Suppose f(x,y) is a differentiable function with continuous second-order partial derivatives and values given in the table. 4 3 1 6 ) , (1,0), and (0,1) below, choose the best description of the point. Here \"cannot determine\" means \"cannot determine from the information given.\" A B Cc D E (a) For each of the three points (0,0 . local maximum . local minimum . saddle point . not a critical point . cannot determine the type of point (b) For = ( 1a , ), circle the value of D;f(1,1): ya va) fd) 7 A. a B= Cc. . D. 2 "A (c) The function f is guaranteed to take on an absolute maximum and minimum value on exactly two of the four sets below. Circle those two sets. A. {(a,y): a? +y?