PLEASE HELP ME ILL MARK BRAINLIEST In terms of t, what is the volume of the sphere?
A)
360 cubic feet
B)
180071 cubic feet
27000 cubic feet
D)
36000 cubic feet

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.