Which relation is a function? Select all that apply. {(5,5), (4,4), (3, 3), (2,2)}

{(5,1), (4,1), (3, 1), (2,1)}

{(5,3), (4,1), (3, 2), (2,0)}

{(5,2), (2,5), (5, 3), (3,5)}

{(5,1), (5,2), (5, 3), (5,4)}