You are configuring a virtual machine （VM） that is running on a Windows Server 2008 R2 host server. The primary virtual disk is connected to IDE Controller 0. You need to add a virtual disk to the VM without shutting down the VM. What should you do？（）

• A、Add the virtual disk to IDE Controller 0.
• B、Add the virtual disk to IDE Controller 1.
• C、Add the virtual disk to an existing SCSI controller.
• D、Add a virtual network adapter to the VM. Attach an iSCSI disk to the VM through the virtual network adapter.