Which of these is NOT a function?

(1 point)
Responses

2,3, and 4 only
2,3, and 4 only

3 and 4 only
3 and 4 only

3 only
3 only

1 and 2 only
1 and 2 only

1,3, and 4 only
1,3, and 4 only

All of them
All of them
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The question does not specify the options that should be chosen, so it is not possible to determine which one is NOT a function.