indicate whether the relation is a function. d: {3, 2, 0, 4} r: {5, 6, 7} the relation is not a function.

a) d: {5, 6, 7} r: {3, 2, 0, 4} the relation is a function.
b) d: {3, 2, 0, 4} r: {5, 6, 7} the relation is a function.
c) d: {5, 6, 7} r: {3, 2, 0, 4} the relation is not a function.
d) d: {3, 2, 0, 4} r: {5, 6, 7} the relation is not a function.