What should you include in your plan?

Your Company has one main office and one branch office. An Active Directory site exists for each office.
The offices are connected across a wide area network (WAN) link. Servers in both offices run Windows Server 2008 R2.
You need to plan a failover clustering solution for servers that run Microsoft SQL Server 2008.
The solution must meet the following requirements:
- Withstand the failure of any single cluster node.
- Minimize the number of servers required to implement failover clustering.
What should you include in your plan?
A. Deploy one single cluster that contains one cluster node on each site.
B. Deploy one single cluster that contains two cluster nodes on each site.
C. Deploy two separate clusters that contain one cluster node on each site.
D. Deploy two separate clusters that contain two cluster nodes on each site.