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A control systems analyst is reviewing the defensive posture of engineering workstations on the shop floor. Upon evaluation, the analyst makes the following observations: - Unsupported, end-of-life operating systems were still prevalent on the shop floor. - There are no security controls for systems with supported operating systems. - There is little uniformity of installed software among the workstations. Which of the following would have the greatest impact on the attack surface?
Correct Answer: D
Hardening the engineering workstations using a consistent strategy would have the greatest impact on reducing the attack surface. The workstations are running outdated and unsupported operating systems, with no security controls, and inconsistent software installations, which significantly increases the risk of exploitation. Hardening involves applying patches, reducing unnecessary software, disabling unused services, and ensuring uniform security controls across all systems.