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During the testing of a new application, what is being compared side by side for validation?

  1. The security of both applications

  2. The output of the old and new applications

  3. Performance metrics of the applications

  4. User experience of the applications

The correct answer is: The output of the old and new applications

Comparing the output of the old and new applications is critical during the testing phase to ensure that the new application functions correctly and meets the desired requirements. This side-by-side validation allows testers to confirm that the new application produces the same or improved results as the legacy system. It acts as a benchmark to assess if the new application maintains data integrity and provides the expected outcomes, thus reducing errors and ensuring consistent performance. In this context, evaluating the output is fundamental because it directly impacts the application's effectiveness and functionality. If discrepancies are identified, developers can investigate and rectify any issues before deployment. By focusing on the output comparison, teams can effectively validate whether the new application can reliably replace or enhance the existing solution.