You are decommissioning domain controllers that hold all forest-wide operations master roles.  You need to transfer all forest-wide operations master roles to another domain controller.    
Which two roles should you transfer（）

Your company has an Active Directory domain. The company has two domain controllers named  DC1 and DC2. DC1 holds the schema master role.  
DC1 fails. You log on to Active Directory by using the administrator account. You are not able to  transfer the schema master role.    
You need to ensure that DC2 holds the schema master role.    
What should you do（）

You are decommissioning one of the domain controllers in a child domain. You need to transfer  all domain operations master roles within the child domain to a newly installed domain controller  in the same child domain.    
Which three domain operations master roles should you transfer（）

Your company has an Active Directory domain.    
You log on to the domain controller. The Active Directory Schema snap-in is not available in the  Microsoft Management Console （MMC）.  
You need to access the Active Directory Schema snap-in.    
What should you do（）