Which FSMO role is concerned with domain-wide policies and relationships?

The role that is concerned with domain-wide policies and relationships is known as the Infrastructure Master. This FSMO (Flexible Single Master Operations) role is specifically responsible for managing and maintaining the relationships between objects within a domain and across domains. It updates references from objects in its domain to objects in other domains, which is essential for ensuring that changes are accurately reflected across the system. This role plays a critical part in the functioning of Active Directory by managing cross-domain references and helps to maintain data integrity and consistency throughout the directory.

The other roles focus on different functions within Active Directory: the Domain Naming Master manages the addition and removal of domains in the forest, the Schema Master controls updates to the schema, while the Relative Identifier Master handles the allocation of RIDs to domain controllers. Each of these roles serves a specific purpose, but when it comes to domain-wide policies and the relationships between objects, the Infrastructure Master is the key role involved.