Which of the tables represents a function? 50 points i will give braileist

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
Question 2 options:

1)

Table P

2)

Table Q

3)

Table R

4)

Table S