Which set of ordered pairs represents a function? Group of answer choices
{(–3, –3), (–2, –4), (–2, –1), (–1, –5)}

{(3, 2), (4, 4), (6, 3), (4, 5)}

{(–4, 4), (–2, 4), (1, 4), (5, 4)}

{(4, –3), (4, –1), (4, 3), (4, 6)}