Question: An attribute ( s ) that functions as the primary key of relation A and as a foreign key in relation B of a relational

An attribute(s) that functions as the primary key of relation A and as a foreign key in relation B of a relational database ____.
Question 21 options:
must have unique values in both relations
must have unique values in relation A
must have unique values in relation B
must not have unique values in either relation

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