Which table does not represent a function?
a)
b)
c)
d)
*the tables are below
a.
x f(x)
0 1
2 3
3 4
4 5
5 6
6 7

b.
x f(x)
-3 9
-2 4
-1 1
0 0
1 1
2 4

c.
x f(x)
0 3
2 3
3 3
4 3
5 3
6 3

d.
x f(x)
0 -1
2 3
0 4
2 5
0 6
2 7