need help with this question please and thank u

Suppose f(x, y) is a function with the following data: ( x , y ) f ( x, y ) f ( x , y ) f xx ( x, y ) fu( xx) fay (x,x) (3,1) (2,7) NUD Hmm (6,5) O (a) At (3,1), the function f(x, y) has a: O local maximum O local minimum O saddle point O none of the above (b) At (2,7), the function f(x,y) has a: O local maximum O local minimum O saddle point O none of the above (c) At (6,5), the function f(x, y) has a: O local maximum O local minimum O saddle point O none of the above