Question: Which of the diagrams below depict a valid function - > ? For any diagram which does represent a valid function, identify if the function

Which of the diagrams below depict a valid function ->? For any diagram which does represent a valid function, identify if the function is injective, surjective, bijective, or none of these. Note that is an infinite set, and we do not have infinite diagrams, so we need you to assume that the diagram extends in both directions in the obvious way.
Which of the diagrams below depict a valid function ->? For

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