Which of the following would BEST help to address the risk associated with malicious outsiders...

Role-based access controls (RBAC) are a type of preventive control that limit the access and actions of users based on their roles and responsibilities within the organization. RBAC can help to address the risk of malicious outsiders modifying application data by restricting their access to the data and the functions they can perform on it. RBAC can also enforce the principle of least privilege, which means that users only have the minimum level of access required to perform their tasks. RBAC can be implemented through policies, procedures, and technical mechanisms such as access control lists, encryption, and authentication. References = Risk and Information Systems Control Study Manual, Chapter 4, Section 4.2.1.1, p. 178-179