You plan to deploy a Hyper-V host that runs Windows Server 2008 R2 Service Pack 1 （SP1）. You need to recommend a solution for the virtual machines （VMs） on the Hyper-V host. The solution must meet the following requirements：
- The VMs must not increase beyond their original size.
- The VMs must be backed up by using a host-based backup.
What should you include in the recommendation？（）

You plan to deploy a fault-tolerant virtual infrastructure based on Hyper-V. The virtual infrastructure will include a two-node Hyper-V host cluster that will contain eight virtual machines （VMs）. All of the VMs will run Windows Server 2008 R2 Standard. If one of the nodes fails， the VMs must continue to run on the other node.
You need to identify the minimum number and the type of licenses required for the planned deployment.
What should you identify？（）