Determine which relation is a function.
a. {(–4, 3), (–2, 3), (–1, 2), (2, 5), (3, 2)}
b. {(–4, 1), (–2, 3), (–2, 1), (–1, 5), (3, 2)}
c. {(–4, 1), (–2, 3), (–1, 2), (3, 5), (3, 2)}
d. {(–4, 1), (–2, 3), (–1, 1), (–1, 5), (3, 2)} open study