The primary risk management responsibility of the first line of defense is to implement risk treatment plans. The first line of defense is the operational management and staff who are directly involved in the execution of the business activities and processes. They are responsible for identifying, assessing, and responding to the risks that affect their objectives and performance. Implementing risk treatment plans means applying the appropriate risk response strategies and actions to address the identified risks, and monitoring and reporting the results and outcomes of the risk treatment. The other options are not as primary as implementing risk treatment plans, as they are related to the validation, establishment, or review of the risk management process, not the execution of the risk management process. References = Risk andInformation Systems Control Study Manual, Chapter 1: IT Risk Identification, Section 1.1: IT Risk Management Process, page 15.