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.