What is the primary purpose of a database trigger?

A database trigger is a powerful mechanism designed to automatically execute predefined actions in response to specific events occurring within the database system, such as changes in data. These events can include data insertion, updates, or deletions. The primary purpose of triggers is to enforce business rules, maintain data integrity, or implement logging mechanisms without requiring manual intervention.

For instance, when a new record is added to a table, a trigger can automatically calculate values, validate data, or update related tables. This automation ensures consistency and accuracy in the database management process and can significantly reduce the likelihood of errors that may arise from manual processes.

The other options do not accurately capture the primary function of a trigger. While error reporting, data visualization, and backups are essential aspects of database management, they are not the main purpose of triggers. Triggers specifically focus on executing actions in response to changes, making option B the correct choice.