The best way to ensure that identified risk scenarios are addressed is to review the implementation of the risk response. The risk response is the action or plan that is taken to reduce, avoid, transfer, or accept the risk, depending on the chosen risk treatment option1. Reviewing the implementation of the risk response means checking whether the risk response actions are executed as planned, whether they are effective and efficient in mitigating the risk, and whether they are aligned with the organization’s objectives and risk appetite2. Reviewing the implementation of the risk response helps to monitor and control the risk, identify any gaps or issues, and make any necessary adjustments or improvements. The other options are not the best ways to ensure that identified risk scenarios are addressed, as they are either less comprehensive or less specific than reviewing the implementation of the risk response. Creating a separate risk register for key business units is a way of documenting and tracking the risks that affect different parts of the organization. However, this is not the same as addressing the risk scenarios, as it does not indicate how the risks are treated or resolved. Performing real-time monitoring of threats is a way of detecting and responding to any changes or events that may increase the likelihood or impact of the risks. However, this is not the same as addressing theriskscenarios, as it does not measure the effectiveness or efficiency of the risk response actions. Performing regular risk control self-assessments is a way of evaluating and testing the design and operation of the controls that are implemented to mitigate the risks. However, this is not the same as addressing the risk scenarios, as it does not cover the other aspects of the risk response, such as risk avoidance, transfer, or acceptance. References = Risk and Information Systems Control Study Manual, 7th Edition, Chapter 2, Section 2.1.7, Page 59.