Multiple choices, please help me XD Identify all of the functions below.
O { ( 5 , 1 ) , ( 2 , 2 ) , ( 6 , 6 ) , ( 3 , 4 ) , ( 1 , 1 ) }
O X Y
7 3
0 5
1 3
5 5
3 0
O { ( 5 , 1 ) , ( − 5 , 2 ) , ( 2 , 6 ) , ( 6 , 4 ) , ( − 2 , 1 ) }
O { ( 5 , 1 ) , ( 2 , 2 ) , ( 2 , 6 ) , ( 2 , 4 ) , ( 1 , 1 ) }
O { 3 , 5 , 9 , 7 , 7 }

O X Y
2 3
2 5
1 3
8 2
5 0