The best way to facilitate the implementation of data classification requirements is to assign a data owner. A data owner is a person who has the authority and responsibility for defining, classifying, and protecting the data. A data owner can help to facilitate the implementation of data classification requirements by providing the criteria, categories, roles, and procedures for classifying the data according to its sensitivity, value, and criticality. A data owner can also ensure that the data is handled and stored appropriately, and that the data classification policy is enforced and monitored. The other options are not as effective as assigning a data owner, as they are related to the prevention, audit, or control of the data, not the classification or protection of the data. References = Risk and Information Systems Control Study Manual, Chapter 4: Risk and Control Monitoring and Reporting, Section 4.4: Key Control Indicators, page 211.