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PLEASE HELP!!
Which of the sets of ordered pairs represents a function? (4 points)

A = {(−5, 5), (−2, 2), (2, −2), (5, −5)}
B = {(4, 2), (3, −2), (9, 4), (11, −3)}

Select one:
a. Only A
b. Only B
c. Both A and B
d. Neither A nor B