Your company has a main office and three branch offices. The main office is located in Austin. The branch offices are located in Denver, San Diego, and Chicago.
The network contains an Active Directory forest. The forest contains a single domain. Each office is configured as an Active Directory site.
The site in Austin contains four domain controllers that run Windows Server 2008 R2 and are configured as global catalog servers. The sites in Denver, San Diego, and Chicago each contain a read-only domain controller (RODC) that runs Windows Server 2008 R2. No other domain controllers exist on the network.
You plan to deploy an Exchange Server 2013 organization. Exchange Server 2013 servers will be deployed in the Austin, Denver, and San Diego sites. Users from the Chicago site will access their mailbox remotely.
You need to recommend changes to the Active Directory infrastructure to support the planned deployment of Exchange Server 2013.
What should you recommend?
A. Replace the RODCs in the Denver and San Diego sites with domain controllers that are configured as global catalog servers.
B. Configure the RODCs in the Denver and San Diego sites as read-only global catalog servers.
C. Configure Active Directory automatic site coverage for the Chicago site.
D. Upgrade all of the RODCs to Windows Server 2012.
