SELECT ALL THAT APPLY, MIGHT HAVE MORE THAN ONE OPTION CORRECT

Which of the following functions cannot have an inverse function: Of(x)=x2, when f: Z-> Z a b C 2 d W Of: {(1,0), (2,1), (3,2), (4,3), (5,0)} Of: {(1,0), (2,1), (3,2), (4,3), (5,5)}