👤

12. Which of the relation below is a function?
a. {(2, 3), (3, 4), (5, 1), (2,4)}
c. {(2,3), (3, 4), (6,2), (3, 3)}
b. {(2, 3), (3, 4), (6,2), (7,3)}
d. {(2,3), (3, 4), (6,2), (6,3)}​