HELP‼️
Which is relation to a function?
a. {(5, 0), (0, 1), (5, 2), (4, 4)}
b. {(3, 2), (2, 1), (-1, 2), (3, 3)}
c. {(0, 1), (-4, 1), (4, 2), (-4, -1)}
d. {(1, 2), (2, 4), (-1, 2), (0, 3)}