Which of the tables represents a function?

table a
input output
8 −9
8 −8
10 −8
table b
input output
4 11
7 12
7 13
table c
input output
−4 0
−3 3
−2 5
table d
input output
10 0
10 4
3 7

table a
table b
table c
table d

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