System walk-throughs, reviewing diagrams, and collecting data from devices are examples of which type of assessment?

The correct answer is based on the understanding of assessment types in cybersecurity, particularly in the context of assessing Industrial Automation and Control Systems (IACS).

Passive assessment involves activities where the evaluator does not interact directly with the systems or devices. Instead, the focus is on gathering information through observation and analysis of existing data. System walk-throughs, reviewing diagrams, and collecting data from devices are all activities that exemplify passive assessment methods because they rely on obtaining and analyzing information without actively engaging or testing the system in real-time.

This approach can provide insights into the security posture of the system by highlighting potential areas of concern based on existing configurations and operational conditions without the risk of causing disruption or introducing additional vulnerabilities during the assessment process.

Active assessment, in contrast, typically involves engaging with the system, such as penetration testing or simulations, which would not fit the descriptions given in the question. Compliance assessment focuses specifically on determining whether the system meets certain regulatory or industry standards, while exploit assessment would test specific vulnerabilities in systems by attempting to exploit them. Therefore, passive assessment is the appropriate classification for the activities described in the question.