Your physical environment is configured as shown in the network diagram. The firewall in the diagram is a generic hardware based firewall product.

You are planning to deploy a Windows Server 2008 R2 Hyper-V server to virtualize your current physical environment. You have the following requirements：
- The Web server VM in the perimeter network （also known as DMZ） must be able to communicate with only the SQL Server computer VM through the firewall.
- The SQL Server computer VM must be able to communicate with the Web server VM.
- The client computer VM must be able to communicate with the Web server VM.
- Two dedicated iSCSI networks must available to the SQL Server computer VM.
- A dedicated management interface must be available for the Hyper-V server.
You need to choose the appropriate virtual network configuration.
Which networking solution should you choose？（）

You plan to deploy two virtual machines （VMs） that will run Microsoft Exchange Server 2010 and will have the Mailbox server role installed. The VMs will have access to only the local disks on the Hyper-V hosts.
You need to recommend a solution to ensure that the Exchange Server Mailbox services are available if a single VM fails.
What should you include in the recommendation？（）