Which command-line tool can be used to manage Active Directory replication and operations?

The command-line tool that can be used to manage Active Directory replication and operations is indeed represented by all of the choices provided, making it appropriate to select the option indicating all of them.

Repadmin is specifically designed to assist in managing and troubleshooting replication between domain controllers in Active Directory. It can help you monitor the replication status, identify replication failures, and perform specific replication tasks.

DCDiag focuses on the health of domain controllers and can diagnose issues with replication mechanisms as part of its broader assessment of Active Directory health. It checks for various aspects of domain controller configuration and connectivity which can impact replication.

Ntdsutil is a more advanced command-line tool that can be used for a variety of Active Directory management tasks, including maintenance of the Active Directory database, managing snapshots, and other administrative functions that may indirectly influence replication processes.

Using all these tools together provides a comprehensive approach to managing Active Directory replication and operations, as they each specialize in different aspects related to Active Directory, allowing for a more robust management strategy.