In the context of security groups, what does a domain security policy typically govern?

A domain security policy is crucial in defining access and permissions within a system, specifically governing how users can interact with data and reports. This policy typically outlines the rules and guidelines that dictate which users or security groups have the authority to view, modify, or manage various types of data and reports within the system. By controlling access through a domain security policy, organizations can protect sensitive information and ensure that users only have the permissions necessary for their specific roles.

The other options don't align with the primary focus of a domain security policy. User interface settings relate more to the visual and navigational elements of the software, while system performance metrics are concerned with the operational efficiency of the system rather than security. Training requirements, while important for user competency, do not fall under the governance of a security policy but are more aligned with compliance and operational training strategies. Thus, focusing on access to data and reports encapsulates the essence of what a domain security policy is designed to manage.