The audit team used technical verification, making option B the correct answer. Technical verification involves examining technical configurations, system settings, or operational characteristics of information systems to verify whether controls are implemented and effective. In this scenario, the auditors examined server logs to determine whether they could be altered or deleted, which directly assesses the technical enforcement of logging controls.

ISO/IEC 27002:2022 control 8.15 requires organizations to ensure that logs are protected against unauthorized modification or deletion. Verifying this requirement cannot be achieved through interviews or documentation alone; it requires direct interaction with or inspection of the technical system.

Option A is incorrect because analysis refers to evaluating information, patterns, or results after evidence has been collected, not to the act of examining system configurations. Option C is incorrect because observation involves watching activities or processes being performed, such as monitoring staff behavior or physical security practices, not inspecting system-level controls.

Therefore, reviewing server logs for editability or deletion capability is a clear example of technical verification, which is an appropriate and necessary audit procedure for technological controls.