单项选择题 Your company has a main office and a branch office.   The network contains an Active Directory forest. The forest contains three domains.   The branch office contains one domain controller named DC5. DC5 is configured as a global catalog  server， a DHCP server， and a file server.  You remove the global catalog from DC5.   You need to reduce the size of the Active Directory database on DC5. The solution must minimize the  impact on all users in the branch office.   What should you do first（）

单项选择题 Your network contains an Active Directory domain. The domain contains five domain controllers.   A domain controller named DC1 has the DHCP role and the file server role installed.   You need to move the Active Directory database on DC1 to an alternate location. The solution must  minimize impact on the network during the database move.   What should you do first（）

单项选择题 Your network contains a domain controller that runs Windows Server 2008 R2.   You run the following command on the domain controller：   dsamain.exe  dbpath c：\$SNAP_201006170326_VOLUMEC$\Windows\NTDS\ntds.dit  ldapport 389   -allowNonAdminAccess   The command fails.   You need to ensure that the command completes successfully.   How should you modify the command（）