Two congruent figures, A and B, are shown on a coordinate plane below. Ay
V
Which of these reflection(s) map figure A onto figure B?
a reflection over the line y
a reflection over the line y--
a reflection over the line xo followed by a reflection over the line x = 0
a reflection over the line xo followed by a reflection over the line y = 0

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.