Determine which relation is a function.
a.
{(–3, 3), (–2, 3), (–1, 1), (0, 4), (0, 1)}
b.
{(–3, 2), (–1, 3), (–1, 2), (0, 4), (1, 1)}
c.
{(–3, 2), (–2, 3), (–1, 1), (0, 4), (0, 1)}
d.
{(–3, 2), (–2, 3), (–1, 2), (0, 4), (1, 1)}

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