The correct answer is D. All of the above.
Reliability, usability, and objectivity are all important considerations in research. Reliability refers to the consistency of results, while usability refers to how easy it is to use a test. Objectivity refers to the extent to which a test is free from bias.
A test that is reliable will produce consistent results when it is administered multiple times to the same group of people. A test that is usable will be easy for people to understand and complete. A test that is objective will not be influenced by the person administering the test or the person taking the test.
All of these qualities are important in research because they help to ensure that the results of a study are accurate and meaningful. If a test is not reliable, then the results of the study may not be accurate. If a test is not usable, then people may not be able to complete it correctly, which could affect the results of the study. If a test is not objective, then the results of the study may be biased, which could also affect the results of the study.
Therefore, it is important to choose tests that are reliable, usable, and objective when conducting research.