Your company has offices in Toronto and Chicago. Both offices belong to an Active Directory directory service site named Site1. There is only one domain controller in Site1. Users in the Chicago office are experiencing slow logon times. You create a new Active Directory site for the Chicago office named Site2. You promote a new domain controller and create a site link between Site1 and Site2. You need to improve logon times for the Chicago users and enable Active Directory replication between the Site1 and Site2 domain controllers.  Which two actions should you perform？（）

• A、 Designate the new domain controller as a preferred bridgehead server for Site1.
• B、 Create a subnet object and associate it with Site2.
• C、 Place the new domain controller in Site2.
• D、 Configure a new site link bridge object.