Which option must be set in smb.conf to configure Samba as an Active Directory Domain Controller?

To configure Samba as an Active Directory Domain Controller, the correct option is to set "server role = active directory domain controller" in the smb.conf file. This directive specifically instructs Samba that it should operate as an Active Directory Domain Controller, enabling it to manage user accounts, authenticate users, and offer various directory services as part of an Active Directory environment.

This configuration is essential because it allows Samba to implement the necessary capabilities to act in accordance with the Active Directory standards, including support for Kerberos authentication, LDAP directory services, and the requisite domain management functionalities.

While the other options might sound relevant, they do not correctly reflect the necessary configuration directive required to set up Samba as an Active Directory Domain Controller. Thus, the "server role" setting is crucial for establishing the server's intended function within the network architecture.