You have a server that runs Windows Server 2008 and has the Windows Server Virtualization （WSv） server role installed. You create a new virtual machine. You need to configure the virtual machine to meet the following requirements： Allow network communications between the virtual machine and the host system. Prevent communications with other network servers. What should you do first？（）

A. Install the Microsoft Loopback Adapter.
B. Create a new Virtual Network Switch.
C. Enable Internet Connection Sharing （ICS）.
D. Set the Connection to None for the network interface card.