Find the maximum value of the function for the polygonal convex set determined by the given system of inequalities.a. the maximum is at  .c. the maximum is at  b. the maximum is at  

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.