Which of the following are valid server role values for Samba 4? (Choose THREE correct answers.)

Active Directory Domain Controller is a valid server role for Samba 4. This designation allows Samba to act as a domain controller within an Active Directory environment, fulfilling tasks such as authenticating users and managing permissions. Samba 4 introduced significant improvements to its AD capabilities, allowing it to fully interact with other Active Directory services and provide a high level of compatibility with Microsoft Windows servers.

The other roles listed do not represent valid server roles in Samba 4. The designation of a server role must align with the capabilities introduced in Samba 4, which significantly focuses on Active Directory interoperability. Thus, while historical terms were relevant in earlier versions of Samba, they are not applicable to the server roles defined in the context of newer versions, particularly Samba 4.