Question 3. If relation R declares some attribute(s) as a Foreign Key (FK) referencing to another relation S. Please select correct statement(s) regarding foreign key and referential integrity. A. The corresponding/referencing attribute(s) must be declared UNIQUE or Primary Key in relation S. B. The corresponding/referencing attribute(s) might not be declared as UNIQUE or Primary Key. C. By default, the value(s) of the FK attribute(s) in relation R must also appear in relation S. D. None of the above.

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