单项选择题 You have a single Active Directory directory service domain. You back up your domain controllers on a nightly basis. An organizational unit （OU） is accidently deleted. You need to restore the objects that were located in the OU.  What should you do？（）

单项选择题 Your company has a main office in Chicago and a branch office in New York. The company has a singleActive Directory directory service forest with four domains. Two of the domain controllers are described in the following table.   An application has a server component and a client component. When the server component is installed， several schema classes and attributes are added. A user in the ne.sales.contoso.com domain installs the client component on his client computer. You then install the server component. Thirty minutes after you install the server component， the user attempts to run the client component， but receives an error message stating that the schema objects cannot be found. You verify that the objects are present on DC1. The users logon server is DC4. You need to ensure that the user can immediately run the client component.  What should you do？（）

单项选择题 You have a single Active Directory directory service domain. You back up your domain controllers on a nightly basis. You perform Group Policy backups on a nightly basis. A Group Policy object （GPO） is accidentally deleted. You need to restore the GPO.  What should you do？（）