The document discusses the five operations master roles that are automatically assigned to the first domain controller created in a domain. These include the schema master, domain naming master, PDC emulator, RID master, and infrastructure master. The schema master and domain naming master are forest-level roles that control the Active Directory schema and domains. The RID master, PDC emulator, and infrastructure master are domain-level roles that manage security principals, time synchronization, and object references during replication.