Question: 4 . Referential integrity is where a . references in the database are identical to references in an ER diagram. b . foreign key always

4. Referential integrity is where a. references in the database are identical to references in an ER diagram. b. foreign key always refers to a primary key value or is NULL. c. primary keys in one table always refer to primary keys in another table. d. foreign keys in one table always refer to foreign keys in another table.

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