Which set of ordered pairs represent functions from A to B? Explain.
A = {a, b, c} and B = {0, 1, 2, 3}
a. {(a, 1), (c, 2), (c, 3), (b, 3)}
b. {(a, 1), (b, 2), (c, 3)}
c. {(1, a), (0, a), (2, c), (3, b)}