Select all the transformations that have the same result. A. 180° clockwise rotation about the origin
B. a reflection and a translation
C. a translation and a rotation
3
D. Reflection in the x-axis, then reflection in the y-axis
E. 180° counterclockwise rotation about the origin
E Reflection in the line y = x

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.