Which is the graph of f(x) =
6
5
4
3
3
2
2
2+
2
1
1
3 2 1
1
2
3
4
5
6
-3 -2 -1
1
2
3
4
56
-3 -2 -1
1
3
4 5 6
-3 -2 -1
1
2
4
6