What should you implement?

Your network contains an Active Directory forest. The forest functional level is Windows Server 2016.
The network contains Linux servers that use MIT Kerberos V5 to provide an authentication, authorization, and access service.
You need to ensure that users can use their Active Directory credentials to access the resources on the Linux servers. The solution must minimize administrative effort.
What should you implement?
A. an external trust
B. a realm trust
C. Active Directory Federation Services (AD FS)
D. a Web Application Proxy