Two Exchange Servers 2010 has Mailbox Servers.You create a DAG.You need to install all of Failover Clustering Components on Mailbox Servers. What should you do？（）

• A、Add both Servers to DAG
• B、Install Application Server Role on both Servers
• C、Run Setup /Roles：MB /NewCMS on both servers
• D、Run Start -clusteredMailboxServer cmdlet on both servers