Implementing an emergency change authorization process is the best control for an organization that allows programmers to change production systems in emergency situations, because it helps to ensure that the changes are justified, approved, documented, and tested before they are implemented, and that they are monitored and reviewed after they are implemented. An emergency change is a change that is required to resolve or prevent a critical issue or incident that may affect the availability, performance, or security of the production systems. A production system is a system that is used to support or enable the operational or business functions or processes of the organization. An emergency change authorization process is a process that defines the roles and responsibilities, criteria and procedures, and tools and techniques for managing and controlling the emergency changes. Implementing an emergency change authorization process is the best control, as it helps to minimize the risks and impacts of theemergency changes, and to maintain the integrity and reliability of the production systems. Periodically reviewing operator logs, limiting the number of super users, and reviewing the programmers’ emergency change reports are all possible controls for an organization that allows programmers to change production systems in emergency situations, but they are not the best control, as they do not provide a comprehensive and consistent approach to the emergency change management. References = Risk and Information Systems Control Study Manual, Chapter 5, Section 5.4.1, page 208