Question

What are the inputs of the following function?

{(-3, 2), (-4, 2), (8, 3), (7, 1)}



{-4, -3, 7, 8}

{1, 2, 3}

{-4, -3, 1, 2, 3, 7, 8}

{1, 2, 3, 7, 8}