When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n):$?

referential integrity constraint.

When the values in one or more attributes being used as a foreign key

1.	When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n):$?
A.	transitive dependency.
B.	insertion anomaly.
C.	referential integrity constraint.
D.	normal form.
Answer» D. normal form.