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In a relational database, which of these is true about foreign keys? Group of answer choices They are used as a primary method of enforcing

In a relational database, which of these is true about foreign keys?

Group of answer choices

They are used as a primary method of enforcing durable transactions, preventing database corruption

Every table must have at least one field that is a foreign key

They must be unique within a particular table

They can be NULL

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