John works as a systems engineer for BlueWell Inc. He has modified the software, and wants to
retest the application to ensure that bugs have been fixed or not. Which of the following tests
should John use to accomplish the task?

A.
Reliability test

B.
Functional test

C.
Performance test

D.
Regression test

Explanation:
John should use the regression tests to retest the application to guarantee that bugs
have been fixed. This test will help him to check that the earlier working functions have not failed
as a result of the changes, and newly added features have not created problems with the previous
versions. The various types of internal tests performed on builds are as follows: Regression tests:
It is also known as the verification testing. These tests are developed to confirm that capabilities in
earlier builds continue to work correctly in the subsequent builds. Functional test: These tests
emphasizes on verifying that the build meets its functional and data requirements and correctly
generates each expected display and report. Performance tests: These tests are used to identify
the performance thresholds of each build. Reliability tests: These tests are used to identify the
reliability thresholds of each build.