Which of the following are the coordinates of point f', the image of point F, after a rotation of 90° about the origin? 5
E: (0, 3)
J: (3, 2)
G: (-4,1)
5
H: (1, -4)
Answer choice- a(3,0),b(-3,0),c(0,-3),d(0,3).

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.