Which of the following sets of coordinate pairs is not a relationship where y is a function of x?1. {(-3, 1), (0, 5), (2, 7), (5, 1)}2. {(-2, 4), (-1, 0), (1, 7), (-2, -4)}3. {(-3, 10), (-2, 5), (1, 2), (2, 5)}4. {(4, 16), (5, 25), (7, 49), (10, 100)}