Which of the tables represents a function? (5 points)

table a
input
output
7
2
8
1
5
6
table b
input
output
5
2
3
5
5
6
table c
input
output
1
2
1
9
7
3
table d
input
output
2
6
6
7
6
2
group of answer choices

table a

table d

table b

table c