Which of the following signs is not an indicator of OT-based security incidents in an organization?

The correct choice reflects that having enabled OT-based security monitoring solutions is a positive step toward securing an organization's operational technology (OT) environment. It indicates that the organization is proactive in monitoring and safeguarding its systems, rather than pointing to any incident or breach.

In contrast, unauthorized access attempts, network traffic anomalies, and outdated software on devices are all signs of potential security incidents. Unauthorized access can signify intruders attempting to breach systems, network traffic anomalies may indicate unauthorized data exchanges or potential attacks, and outdated software poses vulnerabilities that can be exploited by attackers. Thus, enabling security monitoring is a protective measure rather than an indicator of an incident.