In Software Maintenance which type of testing is being used ?A) System TestingB) Regression TestingC) Integration TestingD) Unit Testing

In software maintenance, the most pertinent type of testing typically used is B) Regression Testing.

Explanation:

When software undergoes maintenance, it often includes bug fixing, enhancements, or changes to the code. Regression testing is crucial in this context because it ensures that new changes do not adversely affect the existing functionality of the software. This type of testing involves re-running previously completed tests and verifying that the software still performs as expected after modifications.

While the other testing types (system, integration, and unit testing) can also play roles in the overall software development lifecycle, regression testing specifically addresses the concerns that arise during maintenance, making it essential for confirming the reliability of the software after changes have been made.

Conclusion:

In summary, regression testing is integral during software maintenance to ensure that all functionalities remain intact and that new changes do not introduce new bugs.