Question 18 (6 points) Examine the function f(x, y) = -10x2 + 3y2 - 4x - 7y - 3 for relative extrema. O a) saddle point at (- }, ?) O b) relative minimum at (- , - O c) saddle point at ( 3 , ? ) O d) relative maximum at (- , ?) O e) saddle point at 5