Your network contains an Active Directory domain named contoso.com. The domain contains 20 computer accounts in an organizational unit （OU） named OU1. A user account named User1 is in an OU named OU2.You are configuring a Group Policy object （GPO） named GPO1. You need to assign User1 the Backup files and directories user right to all of the computer accounts in OU1.Which two actions should you perform？（）

A. Link GPO1 to OU1
B. Link GPO1 to OU2.
C. Modify the Delegation settings of GPO1.
D. From User Configuration in GPO1， modify the security settings.
E. From Computer Configuration in GPO1， modify the security setting