Your network consists of a single Active Directory domain and a single Active Directory site that has a corresponding subnet object.

The company has a main office and a branch office. The relevant portion of the network is configured as shown in the exhibit.

Users in both offices report that it occasionally takes more than one minute for the global address list (GAL) to open from Microsoft Office Outlook 2003.

You need to optimize user access to the GAL from both offices. The solution must minimize the impact if a single domain controller fails.

What should you do?

A.
Move DC1 to the branch office.

B.
Move DC2 and Exch2 to the mail office.

C.
Configure Exch1 to use DC1 for directory access. Configure Exch2 to use DC2 for directory access.

D.
Create an Active Directory site and a corresponding subnet for the branch office. Move DC2 to the branch office site.