Your companys network environment includes the hypervisors described in the following table.  You manage the Microsoft Hyper-V Server 2008 server by using Microsoft System Center Virtual Machine Manager （VMM） 2008. You need to be able to manage all the hypervisors by using VMM. Which two actions should you perform？（）

• A、Upgrade from VMM 2008 to VMM 2008 R2
• B、Upgrade the VMware ESX 3.0 host servers to VMware ESX 3.5
• C、Upgrade the VMware ESX 3.0 host servers to VMware ESX 4.0
• D、Install VMware VirtualCenter 2.5 in the existing VMware ESX environment