Final answer:
Standards are most useful when expressed in terms easily related to by the individual whose performance is being evaluated.
Step-by-step explanation:
Standards are most useful when expressed in terms easily related to by the individual whose performance is being evaluated (option D). When setting standards for performance evaluation, it is important to consider the perspective of the individual being evaluated. By expressing standards in terms that the individual can easily understand and relate to, it becomes more useful for them to gauge their own performance and make improvements.