Match the Database Integrity Rule to the Appropriate Definition

Multiple Choice

Match the database integrity rule to the appropriate definition.
-Rule 4: Referential Integrity

A) Each record in the database must have a unique identifier called a primary key.
B) Data referenced and stored in related tables must be consistent across the database.
C) The field values must be from a predefined domain.
D) The primary key value cannot be null (empty) .