The primary reason to update a risk register with risk assessment results is to communicate the level and priority of assessed risk to management, as this enables them to make informed decisions about risk response and allocation of resources. The risk register is a tool for documenting and reporting the current status of risks, their causes, impacts, likelihood, and responses. Updating the risk register with risk assessment results ensures that the information is accurate, relevant, and timely. The risk register also helps to monitor and track the progress and effectiveness of risk management activities. The other options are not the primary reasons to update the risk register, although they may be secondary benefits or outcomes of doing so. References = Risk and Information Systems Control Study Manual, Chapter 3: IT Risk Assessment, page 109.