All client computers in your company run Windows 7. Windows Virtual PC is installed on all client computers. You create and configure a virtual machine (VM) named Guest1. You need to use the Guest1 virtual hard disk (VHD) as a base for additional VMs that will run on the same host computer, and minimize the disk space required for each ne w VM. Which type of VHD should you create for the new VMs?（）

• A、fixed size
• B、differencing
• C、dynamically expanding
• D、linked to a physical hard disk