单项选择题 You plan to deploy Exchange Server 2010 on a new server. The server will be a member of a database availability group. You need to identify the operating system that can be installed on the server to support Exchange Server 2010. Your solution must minimize costs.  Which operating system should you identify（）？

单项选择题 YouhaveanExchangeServer2010organizationnamedContoso.comthatcontainsamail-enabledDomainLocalgroupnamedGroup1.Usersfromoutsidetheorganizationreportthatalle-mailmessagessenttogroup1@contoso.comgenerateanon-delivery-report（NDR）.Youneedtoensurethatusersfromoutsidetheorganizationsende-mailtogroup1@contoso.com.Whatshouldyoumodifyforgroup1？（）

单项选择题 Your network contains an Active Directory forest. All domain controllers run Windows Server 2008. You need to ensure that you can install an Exchange Server 2010 server in the Active Directory forest.  What should you do（）？