Your company uses Windows Server 2008 R2 Hyper-V servers to provide a Microsoft Virtual Desktop Infrastructure （VDI） environment. Maintenance tasks result in reduced capacity on several servers. You need to prevent servers from experiencing performance problems during maintenance. What should you do？（）

A. Set the user logon mode on every server to Enabled
B. Create additional DNS A records for the servers， and use DNS round-robin
C. In Remote Desktop Connection Broker， assign a lower weight to the servers that will undergo maintenance
D. In Remote Desktop Connection Broker， assign a higher weight to the servers that will undergo maintenance