You are the network administrator for Blue Yonder Airlines. You plan to create an Active Directory domain named blueyonderairlines.com that will have a functional level of Windows Server 2003. Your company has one main office and four branch offices， which are all located in one country. A central security department in the main office is responsible for creating and administering all user accounts in all offices. Each office has a local help desk department that is responsible for resetting passwordswithin the individual department’s office only. All user accounts are located in the default Users container. You need to create an organizational unit （OU） structure to support the delegation of authority requirements. You want to minimize the amount of administrative effort required to maintain the environment. What should you do？（）

A. Create a top­level OU named BlueYonderAirlines_Users under the blueyonderairlines.com domain. Create a separate child OU for each office under BlueYonderAirlines_Users. Move the user accounts of all employees in each office to the child OU for that office.
B. Create a top­level OU named Main_Office under the blueyonderairlines.com domain. Move the user accounts of all users in the main office to the Main_Office O
Create a separate child OU for each branch office under the Main_Office O
D. Move the user accounts of all users in each branch office to the child OU for that office.
E. Create a top­level OU named BlueYonderAirlines_Users under the blueyonderairlines.com domain. Create a child OU named Central_Security under BlueYonderAirlines_Users. Move the user accounts of the central security department users to the Central_Security O
F. Create a child OU named Help_Desk under BlueYonderAirlines_Users. Move the user accounts of the help desk users to the Help_Desk O
G. Create a top­level OU named BlueYonderAirlines_Users under the blueyonderairlines.com domain. Create a child OU named Central_Security under BlueYonderAirlines_Users. Move the user accounts of the central security department users to the Central_Security O
H. Create a separate child OU under BlueYonderAirlines_Users for each office. Move the user accounts of the help desk users in each office to the child OU for that office.