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（）

Your network contains an Active Directory forest. The forest contains two domains named  contoso.com and woodgrovebank.com.  
You have a custom attribute named Attibute1 in Active Directory. Attribute1 is associated to User objects.  
You need to ensure that Attribute1 is replicated to the global catalog.  
What should you do（）