A relation describes a relationship and pairs input values with output values. Relations can be represented as

A ordered pairs, graphed on a coordinate plane, listed in an x/y table of values.
B graphed on a coordinate plane, listed in an /y table of values or as a mapping.
C ordered pairs, graphed on a coordinate plane, listed in an /y table of values or as a mapping.
D ordered pairs, graphed on a coordinate plane, or as a mapping

D ordered pairs, graphed on a coordinate plane, or as a mapping