Which of the following is true of foreign keys?     A foreign key should always be linked to a primary key of another table. A foreign key could be linked to a candidate key of a table. A foreign key is not needed if the data type is different. A foreign key can be linked to any foreign key.

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A: Answer is

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SQL Query

Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed by using SQL.