Question: A referential constraint: A . Must have primary key and foreign key columns that have identical names B . Ensures that a primary key does

A referential constraint:
A. Must have primary key and foreign key columns that have identical names
B. Ensures that a primary key does not have duplicate values in a relation
C. Defines a many-to-many relationship between two relations
D. Ensures that a foreign key value always refers to an existing primary key value

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