Your company has a main office and a branch office. The offices connect by using WAN links. The network consists of a single Active Directory domain. An Active Directory site exists for each office. Servers in both offices run Windows Server 2008 R2 Enterprise. You plan to deploy a failover cluster solution to service users in both offices. You need to plan a failover cluster to meet the following requirements： èMaintain the availability of services if a single server fails èMinimize the number of servers required What should you include in your plan？（）
- ADeploy a failover cluster that contains one node in each office.
- BDeploy a failover cluster that contains two nodes in each office.
- CIn the main office， deploy a failover cluster that contains one node. In the branch office， deploy a failover cluster that contains one node.
- DIn the main office， deploy a failover cluster that contains two nodes. In the branch office， deploy a failover cluster that contains two nodes.