Your network contains two data centers named Datacenter1 and Datacenter2. An Active Directory site exists for each data center.  The data centers connect to the Internet by using a direct link.  The data centers connect to each other by using a high-speed WAN link.  You plan to deploy Exchange Server 2010 Mailbox servers in both data centers. You need to plan message routing to meet the following requirements：.Ensure outbound delivery of e-mail messages if a single server fails .Automatically load balance the Hub Transport server in each site .Deploy the minimum number of servers What should you include in the plan？（）

• A、In each data center， deploy one Hub Transport server. Create and configure one Send connector.
• B、In each data center， deploy two Hub Transport servers. Create and configure one Send connector.
• C、In each data center， deploy one Edge Transport server. Create and configure two Send connectors.
• D、In each data center， deploy two Edge Transport servers. Create and configure two Send connectors.