Which relation is a function?

The second graph, top right

Step-by-step explanation:

#1, top left

Has repeating x- values at x = -2, not a function

#2, top right

No repeat, input or outputs, is a function

#3, bottom left

Has repeating x- values at x = 0, not a function

#4, bottom right

Has repeating x- values at x = -1, not a function

For being nice i appreciate it but abc