A risk heat map is a graphical tool that displays the overall risk of the project to senior management by showing the probability and impact of individual risks in a matrix format. A risk heat map can help to prioritize the risks, communicate the risk exposure, and monitor the risk response. A risk heat map can also show the risk appetite and tolerance levels of the organization, as well as the residual risk after the risk response. The other options are not the most effective ways to represent the overall risk of the project to senior management, although they may be useful or complementary to the risk heat map. Aggregated key performance indicators (KPIs) are metrics that measure the performance of the project against the objectives, but they do not show the uncertainty or variability of the project outcomes. Key risk indicators (KRIs) are metrics that measure the level of risk or the effectiveness of the risk response, but they do not show the relationship between the probability and impact of the risks. A centralizedrisk register is a document that records the details of the individual risks, such as the description, category, cause, effect, probability, impact, response, and status, but it does not show the overall risk of the project in a visual or concise way. References = Managing overall project risk, Project Risk Management - Quick Reference Guide, 10 Common Project Risks (Plus the Steps To Solve Them), What Is Project Risk Management: Benefits, Challenges, Best Practices