Which relation represents a function? A. {(6, 5), (5, 4), (4, 3), (3, 2), (5, 6)} B. x 10 5 0 5 10 y 1 2 3 4 5 C. An image of 2 oval shapes with 1,2 connected to 5 and 3 connected to 7 and 4 connected to 7,8 by unidirectional arrows. Text that reads: Oval1. 1,2,3,4. Oval2. 5,6,7,8. D. An illustration of a graph representing a function. Text that reads: X-axis. -4,-3,-2,-1,1,2,3,4. Y-axis. 4,3,2,1,-1,-2,-3,-4.