单项选择题 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（）

单项选择题 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（）

单项选择题 Your network contains a single Active Directory domain that has two sites named Site1 and Site2.   Site1 has two domain controllers named DC1 and DC2. Site2 has two domain controllers named DC3  and DC4.  DC3 fails.   You discover that replication no longer occurs between the sites.   You verify the connectivity between DC4 and the domain controllers in Site1.  On DC4， you run repadmin.exe /kcc.   Replication between the sites continues to fail.   You need to ensure that Active Directory data replicates between the sites.   What should you do（）