Does each relation represent a function? Choose Yes or No.
(1,3), (2,5), (2,7), (4,9)
(1,3), (2,5), (3, 7). (4.9)
(1,3), (1,5), (1, 7), (1,9)
(1,3), (2, 3), (3, 3), (4,3)