Final answer:
Inserting a check mark in the cascade delete check box will ensure that any record deleted in the primary table is automatically deleted in the related table.
Step-by-step explanation:
If referential integrity has been enforced in a relationship, inserting a check mark in the cascade delete check box will ensure that any record deleted in the primary table is automatically deleted in the related table. Cascade delete is a feature in database management systems that allows for the deletion of records in one table to automatically trigger the deletion of related records in another table. This ensures that the integrity of the data is maintained and that no orphan records are left behind.