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？（）

• A、Two external networks and four internal networks
• B、Three external networks and two private networks
• C、One external network and four private networks
• D、Two external networks and three private networks