问题：

[单选]

You are the network administrator for Your network consists of a single Active Directory domain named All domain controllers run Windows Server 2003.
TestKing consists of a main office and two branch offices. The company expands to an additional branch office. This branch office has very little available network bandwidth.
You need to install a new domain controller named DC9 at the new branch office.
Your installation must minimize costs and network traffic.
What should you do?（）

A . Back up the System State data of an existing domain controller on removable media. Mail a physical copy of the backup to the branch office. Use the backup to install Active Directory on DC9.
B . For the branch office, create a new Active Directory site that contains no other domain controllers. Install Active Directory on DC9.
C . Place DC9 on an IP subnet that already contains a domain controller. Install Active Directory on DC9. Physically transport DC9 to the branch office.
D . Back up the System State data of an existing domain controller. Compress the backup. Copy the backup to DC9 at the branch office. Uncompress the backup. Use the backup to install Active Directory on DC9.