You manage an AD DS domain with 20 sites; user management is centralized. After adding users to a group, the change does not appear on a domain controller in a remote site. To determine whether the group modification has replicated to other domain controllers, which tool should you use?

The Active Directory Replication Status Tool (ADReplicationStatus) is the correct choice because it provides a comprehensive view of the replication status between domain controllers, allowing you to quickly identify replication failures and their causes. Active Directory Sites and Services is used for configuring sites, subnets, and site links, not for monitoring replication status. Microsoft Support and Recovery Assistant is a general troubleshooting tool for Microsoft products, not specifically for AD replication. File Replication Service (FRS) Status Viewer is outdated and irrelevant for modern AD replication, which primarily uses Distributed File System Replication (DFSR).