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Which of the following correctly describes a foreign key?
An attribute that forms part of a composite primary key to uniquely identify a record in a table.
An attribute that uniquely identifies a record in a relational database table.
An attribute that is copied to an index data structure in order to optimise query efficiency for those rows / records associated with the copied attribute.
An attribute that corresponds to the value of a primary key in another table for the purpose of creating a link between the two tables.

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