Your network contains two standalone servers named Server1 and Server2 that have Active  Directory Lightweight Directory Services （AD LDS） installed.Server1 has an AD LDS instance.  You need to ensure that you can replicate the instance from Server1 to Server2. 
What should you do on both servers（）

Your network contains an Active Directory domain. The domain contains three domain controllers.  
One of the domain controllers fails.  
Seven days later， the help desk reports that it can no longer create user accounts.  You need to ensure that the help desk can create new user accounts. 
Which operations master role should you seize（）