What aspect of view-based access controls allows for user-specific data visibility?

User-specific data visibility within view-based access controls is fundamentally achieved through user assignment. This aspect involves linking specific users to designated views or segments of data, which allows each user to access only the information they are authorized to see based on their role, position, or any other criteria set forth by the organization's policy.

When a system utilizes user assignment, it ensures that individuals have custom-tailored access according to their needs, whether for operational purposes, data sensitivity, or compliance with regulatory requirements. This method enhances security by minimizing unnecessary access to data, thereby reducing the risk of data breaches or unauthorized disclosures.

Thus, by employing user assignment in view-based access controls, an organization can maintain fine-grained control over who sees what data, ensuring both privacy and security in the handling of that information. The other options mentioned do not focus on this individual-centric approach to data visibility; they emphasize different security measures or mechanisms that do not directly correlate to tailoring data access based on individual users.