Q1 Which relation is a function? (Images listed)

Q2 Which relation is a function?

Select all that apply.

{(2, 1), (−2,1), (3, 2), (4,2)}

{(2, 1), (2,3), (−2, 5), (−2,7)}

{(−1, 2), (−2,2), (−3, 2), (−4,2)}

{(2, 2), (3,3), (4, 4), (5,5)}

{(2, 1), (2,3), (3, 4), (4,5)}

Q3 Which relation is a function?
(Image listed below)