Which graph best represents a constant function? (5 points) Select one: a. A graph shows a non linear curve that joins the ordered pairs 0, 0, and 3, 2, and 5, 5. b. A graph shows a straight line that joins the ordered pairs 0, 2 and 5, 2. c. A graph shows a straight line that joins the ordered pairs 2, 0 and 2, 5. d. A graph shows a non linear curve that joins the ordered pairs 0, 5, and 1, 2, and 5, 0.