Your highly available virtual environment includes Windows Server 2008 R2 Hyper-V servers. You are developing a strategy to apply Hyper-V updates. You need to ensure that you can deploy updates while minimizing server downtime. What should you do on each Hyper-V server？（）

• A、Migrate the VMs， apply the update to the Hyper-V server， apply the update to each VM， and then migrate the VMs back to the Hyper-V server
• B、Pause the VMs， apply the update to the Hyper-V server， and then apply the update to the VMs
• C、Apply the update to the Hyper-V server， and then apply the update to the VMs
• D、Take a snapshot of the VMs， and then apply the update to the Hyper-V server