Your company has a single Active Directory domain. You have 30 database servers that run Windows Server 2008 R2.  
The computer accounts for the database servers are stored in an organizational unit （OU） named Data.  
The user accounts for the database administrators are stored in an OU named Admin. The database administrators are members of a global group named D_Admins.  
You must allow the database administrators to perform administrative tasks on the database servers.
You must prevent the database administrators from performing administrative tasks on other servers.
What should you do？（）

Your network contains several branch offices. All servers run Windows Server 2008 R2. Each branch office contains a domain controller and a file server.  
The DHCP Server server role is installed on the branch office domain controllers. Each office has a branch office administrator.  
You need to delegate the administration of DHCP to meet the following requirements：
èAllow branch office administrators to manage DHCP scopes for their own office  
èPrevent the branch office administrators from managing DHCP scopes in other offices
èMinimize administrative effort.
What should you do？（）