Which of the following is the domain of the function {(3, 6), (5, 7), (7, 7), (8, 9)}?(1 point)Responses{3, 5, 7, 8}{3, 5, 7, 8}{6, 7, 9}{6, 7, 9}{(6, 3), (7, 5), (7, 7), (9, 8)}{(6, 3), (7, 5), (7, 7), (9, 8)}{1, 3, 5, 7, 9}

{3, 5, 7, 8}