Which of the tables represents a function?

table p
input output
6 3
1 2
6 7
table q
input output
5 1
7 8
5 6
table r
input output
2 5
6 7
9 8
table s
input output
3 6
4 7
4 5
a) table p
b)table q
c)table r
d)table s

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