单项选择题
A.Public Key Infrastructure
B.Role-based access control
C.Federation
D.Digital certificate
单项选择题 WhichofthefollowingisanidentityservicethatrunsinthecloudasthetrustbrokerandisusedbyExchangeServer？（）
单项选择题 WhichofthefollowingisthenewpermissionsmodelinMicrosoftExchangeServer2010，whichenablesyoutocontinuouslevels，whatadministratorsandend-userscando？（）
单项选择题 You have an Exchange Server 2003 organization. You install a new Exchange Server 2010 server in the organization. You need to ensure that you can modify the default e-mail address policy by using the Exchange Management Console （EMC) What should you do？（）