Which tab should you use to restrict access to a specific item in a model?

The most suitable tab to restrict access to a specific item in a model is the Permissions tab. This tab is designed to manage and define who can view or interact with certain elements in the model, such as dashboards, reports, or data connections. Within the Permissions tab, administrators can specify the level of access that different users or groups have, allowing for granular control over what each user can see and do with respect to the model's components.

Using the Permissions tab ensures that access restrictions are properly enforced and aligned with organizational policies. This is critical in maintaining data security and integrity, particularly when sensitive information is involved. By specifically assigning permissions, it is easier to manage compliance and protect sensitive data from unauthorized access.

The other options, while related to access control and user management in various ways, do not specifically address the need to restrict access to a particular item in a model as directly and effectively as the Permissions tab does.