The best course of action when risk is found to be above the acceptable risk appetite is to execute the risk response plan, which is the set of actions and measures that are designed to reduce, avoid, transfer, or accept the risk. The risk response plan is based on the risk assessment results, the risk appetite and tolerance of the organization, and the cost-benefit analysis of the risk response options. The risk response plan helps to achieve the optimal balance between the potential benefits and threats of the risk, and to align the risk decisions with the organizationalobjectives and context. The other options are not the best courses of action, as they are either too passive or too reactive in dealing with the risk. Reviewing risk tolerance levels may help to adjust the acceptable variation between the risk thresholds and the business objectives, but itdoes not address the actual risk level or impact. Maintaining the current controls may help to prevent the risk from increasing further, but it does not reduce the existing risk exposure or mitigation. Analyzing the effectiveness of controls may help to identify the gaps or weaknesses in the current risk management, but it does not implement the necessary improvements or changes. References = Risk Response Plan in Project Management: Key Strategies & Tips; A Practitioner’s Guide to Ethical Decision Making; How to Manage Project Risk: A 5-Step Guide