Which set of ordered pairs does not represent a function? select two answers. a. { ( 3 , 5 ) , ( 4 , − 1 ) , ( 2 , − 1 ) , ( 2 , 7 ) , ( − 3 , 6 ) } b. { ( 1 , 1 ) , ( 4 , 2 ) , ( 9 , 3 ) , ( 16 , 4 ) , ( 25 , 5 ) } c. { ( 9 , − 3 ) , ( 4 , − 2 ) , ( 1 , − 1 ) , ( 0 , 0 ) , ( 1 , 1 ) , ( 4 , 2 ) , ( 9 , 3 ) } d. { ( − 3 , 9 ) , ( − 2 , 4 ) , ( − 1 , 1 ) , ( 0 , 0 ) , ( 1 , 1 ) , ( 2 , 4 ) , ( 3 , 9 ) } e. { ( 1 , 3 ) , ( 2 , 6 ) , ( 3 , 9 ) , ( 4 , 12 ) , ( 5 , 15 ) }