Which approach is NOT a part of reinforcing risk-aware behavior according to CMMC?

The approach of solely installing antivirus software does not directly contribute to reinforcing risk-aware behavior among users. While antivirus software is an essential component of an organization's security posture, it primarily focuses on detecting and preventing malware rather than promoting an understanding of security risks among employees.

Reinforcing risk-aware behavior involves engaging users in ways that help them recognize, understand, and mitigate risks. Methods such as email advisories, logon-screen messages, and security-awareness events are proactive strategies aimed at educating employees about potential security threats and best practices for maintaining security. These approaches help create a culture of security awareness, which is fundamental for minimizing risks associated with human behavior in the cyber environment. Therefore, option C falls short of encapsulating these vital aspects of reinforcing risk awareness.