A = {1, 2, 3} which of the following function f: A → A does not have an inverse function

Options :

1. {(1, 1), (2, 2), (3, 3)}

2. {(1, 2), (2, 1), (3, 1)}

3. {(1, 3), (3, 2), (2, 1)}

4. {(1, 2), (2, 3), (3, 1)}