Which of the relations given by the following sets of ordered pairs is a function?O {(1, 1), (1, 3), (1, 5), (1, 7), (1, 9)}O {(-2, 1), (7, 5), (-4,0),(3,1),(0,-6)}O {(1,2),(2,3),(3,4), (3,3),(2,2),(1,1)}O {(2, -7), (6,5),(-3,9), (2,0), (-5,3)}