Which of the following is a security measure related to the crediting plans and rating schedules?

The correct choice, which emphasizes not disclosing crediting plans, is rooted in the principle of maintaining the integrity and security of the testing and evaluation process. By keeping the crediting plans confidential, agencies help to prevent any potential manipulation or exploitation of the assessment structure. This measure is essential in ensuring that the evaluation remains fair and that all candidates are judged based on the same standards without any undue advantage gained from knowledge of how scoring is derived.

In the context of security measures, this approach is critical as it safeguards the systemic fairness of the selection process and ensures the validity of the results. A lack of transparency in scoring methodologies can help protect against bias and maintain the credibility of the evaluation, which is particularly important in competitive selection environments.

The other options do not align with best practices for securing the integrity of the crediting process, as sharing information or disclosing scoring keys could lead to tampering or undermine the fairness of the examination system. Limiting access to top management might offer some protection, but it does not address the broader need for security surrounding the evaluation specifics that the chosen answer effectively covers.