جواب سوال گزینه ۳ است.

A database trigger is procedural code that is ""automatically executed in response to certain events"" on a particular table or view in a database. The trigger is mostly used for maintaining the integrity of the information on the database. For example, when a new record (representing a new worker) is added to the employees table, new records should also be created in the tables of the taxes, vacations and salaries.

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