A good measuring instrument must possess all key qualities — objectivity (free from bias), reliability (consistent results), validity (measures what it should), and usability (practical to administer). Since all of A, B, and C are valid characteristics, none of them alone is the single defining characteristic. In standard exam context, if “All of these” is not listed, D — None of these is chosen as a way of indicating that all three are correct but none alone is sufficient.

Correct Answer: D — None of these (all options are correct characteristics).