The correct answer is C. Card Sorting, as stated in the uploaded study guide.
The question emphasizes two related needs: understanding employees' mental model and creating an information architecture that matches user expectations. Card sorting is directly suited to this because participants organize items into categories according to how they naturally perceive relationships between them.
The results reveal how users group concepts, which labels make sense to them, and how content or functions might be organized within navigation. That makes the method particularly useful before finalizing the structure of a new community.
Option A, Cognitive Walkthrough, evaluates whether users can successfully progress through an existing or proposed interaction based on their expected knowledge and goals. It does not primarily generate an information architecture.
Option B, Mind Mapping, can help organize ideas or concepts but is not the user-research technique selected by the guide for uncovering how users classify information.
The study-guide principle is that information architecture should reflect the way users mentally organize the domain rather than merely mirror an internal organizational structure. Card sorting supplies evidence for designing that structure.
Study Guide reference/topics: Card Sorting, information architecture, mental models, user expectations, Discovery.
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