Your network consists of one Active Directory domain.
The functional level of the forest is Windows Server 2003.
All domain controllers run Windows Server 2003.
The relevant portion of the network is configured as shown in the exhibit.
The Bridge all site links option is enabled.
You need to ensure that domain controllers in the spoke sites can replicate with domain controllers in only the hub sites. The solution must ensure that domain controllers can replicate if a server fails in one of the hub sites.
What should you do?
Exhibit:
A.
Lower the site link costs between the spoke sites and the hub sites.
B.
Disable the Bridge all site links option. Create site link bridges that include the site links between each spoke site and the hub sites.
C.
Disable the Bridge all site links option. Install a writable domain controller that runs Windows Server 2008 in each hub site.
D.
Enable the global catalog server attribute for all domain controllers in the hub sites. Upgrade all domain controllers in the spoke sites to Windows Server 2008.