Which of the following items is not commonly associated with restricted interfaces?

Restricted interfaces are designed to limit user interactions and capabilities within a system, providing controlled access to resources and functionalities. Menus, shells, and database views are all examples of restricted interfaces because they allow users to engage with the system in a guided manner, restricting their access to necessary functions and preventing them from executing arbitrary commands outside of the intended usage.

Menus present a controlled set of options, guiding users to perform specific actions without exposing them to underlying system complexities. Shells can be configured to restrict commands available to users, thus establishing a controlled environment for executing commands. Database views enable specific data visibility while hiding the underlying data structure and other sensitive data, further restricting user interaction.

In contrast, keyboards are input devices that do not inherently provide restrictions on user access or interaction with the system. They are merely tools for user input and do not control what a user can or cannot do within a system. Thus, while they play a crucial role in the user experience, they do not function as a restricted interface.