Each choice below represents a relation by a set of ordered pairs. In which of the choices is

Each answer choice below represents a relation by a set of ordered pairs. In which of the answer choices is the relation a function?

Select all correct answers.
Select all that apply:
{(−3,0),(3,−1),(4,10),(−2,0)}
{(5,0),(−2,−1),(−2,10),(2,9)}
{(8,8),(6,9),(1,−2),(−2,9)}
{(−5,7),(−3,−3),(8,−1),(8,5)}
{(7,−5),(6,9),(6,3),(−1,−1)}


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