Your network contains one Active Directory domain named contoso.com. The domain contains 10
domain controllers and a read-only domain controller (RODC) named RODC01.
You plan to replace a domain controller named DC1. DC1 has the schema operations master role.
You need to transfer the schema master role to another domain controller named DC10 before you
remove Active Directory from DC1.
Which tool should you use?

A.
the ntdsutil command

B.
the Set-ADDomain cmdlet

C.
the Install-ADDSDomain cmdlet

D.
the dsadd command

E.
the dsamain command

F.
the dsmgmt command

G.
the net user command

H.
the Set-ADForest cmdlet

Explanation:
To transfer the schema master role using the command line:
Open Command Prompt.
Type:
ntdsutil
At the ntdsutil command prompt, type:
roles
At the fsmo maintenance command prompt, type:
connection
At the server connections command prompt, type:
connect to serverDomainController
At the server connections command prompt, type:
quit
At the fsmo maintenance command prompt, type:
transfer schema master
Reference: Transfer the schema master role