Which of the following options is true regarding user roles in OutSystems?

User roles are a fundamental part of managing access control in OutSystems applications. They can indeed be employed to restrict access to certain screens, ensuring that only authorized users can view or interact with specific functionalities. This helps enhance security and streamline user experience, as users will only see elements relevant to their roles.

In OutSystems, it is important to note that while user roles facilitate security and user management, they are not mandatory for every application. There can be applications that function without defined user roles for simplicity. Additionally, not all users must be assigned roles by default, as this can vary according to the application's specific access requirements. Finally, user roles are designed to manage access rather than impact the performance of an application, meaning they do not add overhead that would slow down performance. Hence, the correct choice emphasizes the critical role of user roles in setting access permissions within the application.