Regression testing is primarily related to

Answer: Maintenance testing

Why: Regression testing means re-running existing test cases after code changes to confirm that previously working functionality still works. This activity is performed when changes (bug fixes, enhancements or updates) are made to the system, which is the essence of maintenance testing.

Key points:

• Regression testing verifies that recent changes have not introduced new defects into existing functionality.

• It is typically part of maintenance activities (after fixes or enhancements) and often uses automated test suites to speed re-testing.

• Other testing types such as functional testing, development testing, or data flow testing are related concepts or techniques but do not capture the primary purpose of regression testing, which is confirming unchanged behavior after modifications.