What categorization allows control of visibility to articles?

The correct answer is data categories. Data categories in the context of service cloud allow organizations to categorize knowledge articles in a way that controls visibility based on user profiles and roles. This categorization system is essential for ensuring that users only see the articles that are relevant to them, thereby enhancing user experience and ensuring that sensitive or irrelevant information is not accessed by unintended audiences.

By setting up a hierarchy of data categories, administrators can define which groups of users have access to certain articles, facilitating targeted knowledge management. For instance, if an article is categorized under a specific data category that only certain teams have access to, those outside the designated team would be unable to view the article, thereby maintaining confidentiality and relevance.

The other options do not pertain directly to the control of visibility for articles in the service cloud. File categories are typically associated with managing files and documents rather than knowledge articles, report categories relate to organizing and managing reports, and access categories do not exist as a recognized term in this context. This reinforces the importance of data categories as a tool for controlling article visibility effectively.