Which relations are functions?

Choose all answers that are correct.

A.
{(1, 4), (2, 5), (4, 6), (6, 4)}

B.
x 0 2 3 2
y 4 3 8 1

C.
A set of points are plotted on a coordinate grid. The points include point 1, 2... point negative 1, 4... point negative 2, 2... point 3, 4... point 2, 6... point negative 3, 6... and point negative 4, 3.

D.
A parabola, opening right, is graphed on a coordinate grid. The parabola goes through point 0, 2, point 4, 0, and point 4, 4.

Question

Which relations are functions?
 
Choose all answers that are correct.
 
 A.
{(1, 4), (2, 5), (4, 6), (6, 4)}
 
 B.
x	0	2	3	2
y	4	3	8	1
 
 
 C.
     A set of points are plotted on a coordinate grid. The points include point 1, 2... point negative 1, 4... point negative 2, 2... point 3, 4... point 2, 6... point negative 3, 6... and point negative 4, 3.       
 
 D.
    A parabola, opening right, is graphed on a coordinate grid. The parabola goes through point 0, 2, point 4, 0, and point 4, 4.