(4,4), (5,4),​ (6,4), (7,4),​ (8,4) B. ​(6,9), (7,19),​ (8,29), (8,39),​ (9,49) C. ​(7,33), (8,30),​ (9,27), (10,24),​ (11,21) D. ​(4,4), (5,6),​ (6,8), (6,10),​ (7,12) Which of thee relation are ​ function?