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A foreign key is defined as a minimal super key that is new that does not...

A foreign key is defined as

a minimal super key that is new that does not contain subset of attributes that is itself a super key.

an attribute (or combination of attributes) that uniquely identifies each entity in a table.

a key that is used strictly for data retrieval purposes.

an attribute (or a combination of attributes) in one table whose values match the primary key in another table or whose values must be null.

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Answer #1

Answer: An attribute(or a combination of attributes) in one table whose values match the primary key in another table or whose values must be null.

Explanation: A foreign key is used in a relational database. This is a column which exists a link with the another table. So, this matches the primary key of the second table to which it is related to. If the corresponding value doesn't exists, then the value should be null.

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