Which of the following test execution outcomes are likely to increase the overall quality of...

The overall quality of the software can be increased by finding and fixing defects before releasing the software to the customers or users. A test case passes means that no defect was found in the tested functionality, which indicates a high quality. A test case fails, defect gets logged which subsequently gets fixed means that a defect was found and corrected, which improves the quality. Some tests are deferred because test environment is not available means that some functionality was not tested, which may leave some defects undetected, which reduces the quality. A bug is found but there is no corresponding test case means that a defect was found by chance or by other means than planned testing, which does not increase the quality of the testing process or the test coverage.