Which relation describes a function?

Step-by-step explanation:

A function is a relation that associates each element x of a set X to a single element y of another set Y.

A)

{(0, 0); (0, 2); (2; 0); (2, 2)}   NO FUNCTION

for 0 are two values, and for 2 are two values

B.

{(-2, -3); (-3, -2); (2, 3); (3; 2)}     FUNCTION

each number {-3, -2, 2, 3} has a single value

C.

{(2, -1); (2, 1); (3, -1); (3, 1)}     NO FUNCTION

for 2 are two values, and for 3 are two values

D.

{(2, 2); (2, 3); (3, 2); (3, 3)}     NO FUNCTION

for 2 are two values, and for 3 are two values

squares, rhombus, rectangles