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Which of the following shows a one-to-one correspondence?
a. {(3,4), (4,5), (5,6), (6,7)}
b. {(0,1), (1,1), (2,1) (3,1)}
c. {(2,2), (2,-2), (3,3), (3,-3)}
d. {(3,3), (0,0), (-3,3)}