What provides privilege management and authorization by storing information about users, computers, security groups/roles, and services on an enterprise network?

The correct answer is directory services. Directory services play a critical role in managing and organizing information about users, computers, and other resources within an enterprise network. By maintaining a centralized repository for important data, directory services enable privilege management and authorization, which are essential for maintaining security and access control.

They typically store information such as user accounts, security groups or roles, permissions, and devices, facilitating the seamless management of access rights across the network. This centralized approach not only simplifies the task of managing user identities and their associated privileges but also enhances security through consistent policy enforcement and easier auditing of access controls.

Other options may provide varying levels of security functions but do not serve the same purpose as directory services. For instance, identity providers handle authentication and can facilitate user access across multiple systems but do not manage the storage of all user-related information directly like directory services do. Cross Domain Solutions focus on securely allowing data flow between differing security domains, and NAC lists primarily relate to controlling access based on device compliance rather than managing user identities comprehensively. Thus, directory services are the optimal choice for privilege management and authorization in an enterprise network environment.