Your virtual environment includes Microsoft Virtual Server 2005 R2 and third-party hypervisors. The virtual machines （VMs） include messaging， application， and database servers. You intend to standardize on Windows Server 2008 R2 Hyper-V servers. You are developing a migration plan by using the Microsoft Assessment and Planning （MAP） Toolkit. You need to gather the necessary information to analyze the current virtual environment. Which MAP assessment should you choose？（）

• A、Windows Server Role Discovery
• B、Application Virtualization Assessment
• C、Virtual Machine Inventory
• D、Windows Server 2008 R2 Readiness