Your virtual environment includes several Windows Server 2008 R2 Hyper-V servers. Some servers have 16 GB of RAM， and some servers have 32 GB of RAM. Each server has a dedicated management network adapter. Several virtual machines （VMs） are configured on local disk arrays.  You plan to enable live migration between all Hyper-V host servers. Your plan must optimize the environment for live migration and enable the live migration of all VMs among all servers. You need to specify the components to add or upgrade.  What should you do？（）

• A、On each Hyper-V host server， provision additional disk resources on the local storage volumes. Add a second network adapter to each host server， and assign this network adapter to a local switch
• B、On each Hyper-V host server， provision additional disk resources on shared storage volumes. Add a second network adapter to each host server， and assign this network adapter to a local switch
• C、On each Hyper-V host server， provision additional disk resources on the local storage volumes. Install additional RAM as necessary so that all host servers have the same amount of RAM
• D、Install additional RAM as necessary so that all host servers have the same amount of RAM. Add a second network adapter to each host server， and assign this network adapter to a local switch