The risk treatment response that should be reflected in the risk register when an IT department decides to keep the data center in-house instead of outsourcing it to an overseas location is risk avoidance. Risk avoidance is a risk response strategy that involves eliminating the source of the risk, or changing the plan or scope of the activity, to avoid the risk altogether. Risk avoidance can help to reduce the risk exposure and impact to zero, by removing the possibility of the risk occurrence. In this case, the IT department avoids the risk of outsourcing the data center to an overseas location, which could involve various threats, vulnerabilities, and uncertainties, such as data security, legal compliance, service quality, communication, or cultural issues. By keeping the data center in-house, the IT department maintains the control and ownership of the data center, and eliminates the potential risk associated with the outsourcing. Risk mitigation, risk acceptance, and risk transfer are not the correct risk treatment responses, as they do not reflect the actual decision and action taken by the IT department, and they do not eliminate the risk source or occurrence. References = CRISC Review Manual, 6th Edition, ISACA, 2015, page 51.