The best way to determine whether system settings are in alignment with control baselines is to perform configuration validation. Configuration validation is the process of verifying that the system settings and parameters are consistent with the predefined standards and requirements, and that they reflect the current and desired state of the system. Configuration validation helps to ensure that the system is configured correctly and securely, and that it complies with the relevant policies, regulations, and bestpractices. Configuration validation also helps to identify and correct any deviations or errors in the system settings, and to prevent or mitigate any potential risks or issues. The other options are not as effective as configuration validation, although they may provide some input or information for the system alignment. Control attestation, penetration testing, and internal audit review are all activities that can help to assess or evaluate the system alignment, but they do not necessarily determine or validate the system settings. References = Risk and Information Systems Control Study Manual, Chapter 3, Section 3.2.1, page 3-11.