The manual states that no system of internal controls can fully eliminate the risk of fraud. Even so, well-designed and effective internal controls can greatly reduce an organization’s vulnerability to fraud by lowering opportunities and increasing the perception of detection. This means an anti-fraud control system is highly valuable, but it is not absolute. The manual does not say that preventive controls should always be prioritized over detective controls or vice versa; rather, both play important and complementary roles. It also specifically says effective controls increase, not decrease, the perception that misconduct will be detected, which is a key deterrent to potential fraudsters. Therefore, the most accurate statement is that an effective system of anti-fraud controls reduces risk but does not completely eliminate it.