Occurrences of specific events are the most likely to cause a key risk indicator (KRI) to exceed thresholds, as they represent the actual or potential realization of the risk. A KRI is a metric that measures the level of risk exposure and the effectiveness of risk response strategies, and it has predefined thresholds that indicate the acceptable or unacceptable risk status. When a specific event occurs that affects the risk, such as a security breach, a system failure, or a compliance violation, the KRI value may change and exceed the thresholds, triggering an alert or an action. A performance measurement, the risk tolerance level, and risk scenarios are not the most likely to cause a KRI to exceed thresholds, as they do not reflect the actual or potential occurrence of the risk, but rather the expected or desired outcome, limit, or simulation of the risk. References = [CRISC Review Manual (Digital Version)], page 121; CRISC by Isaca Actual Free Exam Q&As, question 217.