Which statement is correct? flat files use foreign keys to uniquely identify tables. flat files use foreign keys to secure data. a foreign key is a primary key in another table. a foreign key uniquely identifies a record in a table.

The correct answer would be option C, A foreign key is a primary key in another table.

Explanation:

Databases are used to store large number of data. Data are stored in the form of tables. These data can be identified by using the special keys for each table. Every table has a unique identification key, which is called the Primary key for that table. Then there are other tables in the database as well with their own primary key. So when there is a need to make a relationship between two tables, their primary keys form this relation. The primary key of one table acts as the foreign key for another table. In this way, data can be shared between two tables.  

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