Nessus, Nexpose, and Retina are assessment tools used to discover what?

The assessment tools Nessus, Nexpose, and Retina are primarily designed to discover system vulnerabilities within IT and operational technology environments. These tools perform vulnerability scanning, which involves identifying weaknesses in systems, applications, and network configurations that could be exploited by attackers.

By using these tools, organizations can assess their security posture and obtain actionable insights to remediate vulnerabilities before they can be leveraged by malicious actors. This capability is crucial for maintaining the integrity and security of both Information and Control Systems (IACS), aligning with the goals of risk assessments as outlined in the ISA/IEC 62443 standards.

The other options do not align with the primary function of these tools. While cybersecurity policies are essential for guiding security practices, they are not directly identified or evaluated by vulnerability assessment tools. Software licenses pertain to legal and compliance aspects related to software usage, and data anomalies refer to irregularities in data rather than security weaknesses. Therefore, the focus of Nessus, Nexpose, and Retina on identifying vulnerabilities makes option B the correct choice.