The set of ordered pairs `{(0, 0), (2, 4), (3, 6), (2, 5)}` does not represent a function. Which statement best explains why?

The input 2 is paired with two different outputs.

The output values are not always increasing.

Two different inputs have the same output.

Which of the following sets of ordered pairs $(x, y)$ represents a function?

A = {(-1, 1), (0, 2), (1, 3), (0, 4)}

B = {(5, 10), (6, 10), (7, 10), (8, 10)}

C = {(4, 2), (4, -2), (9, 3), (9, -3)}

D = {(1, 1), (1, 2), (1, 3), (1, 4)}

No, because two different students must have two different ID numbers.

Yes, because each student has one and only one ID number.

No, because you cannot use a student as an input.

Yes, but only if the ID numbers are assigned in alphabetical order.