Juan has blood type A, Lilly has blood type AB, and Aaron has blood type O. Is this relation a function? Explain.

This relation is a function. Each name in the domain corresponds to exactly two elements in the range of blood types.

This relation is not a function. Each name in The Domain corresponds to exactly two elements in the range of blood types.

This relation is a function. Each name in The Domain corresponds to exactly one element in the range of blood types.

This relation is not a function. Each name in The Domain corresponds to exactly one element in the range of blood types. ​