Mathematics Relations and Functions

Which of the following relations from A = {a, b, c} to B = {a, b, c, d} is a function?

1
{(a, b), (b, c), (c, d), (b, b)}
2
{(b, b), (c, c), (a, a), (d, d)}
3
{(a, b), (b, c)}
4
{(a, a), (b, c), (c, d)}
5
Not Attempted

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