单项选择题 云计算的（）特点指的是随机应变的自助服务，高度的自助服务。

单项选择题 E－BOD SDN方案可以为用户提供服务有：企业到企业、企业到云以及()

单项选择题 YourcompanyhasanActiveDirectorydomainthatrunsWindowsServer2008TheSalesOUcontainsanOUforComputers，anOUforGroups，andanOUforUsersYouperformnightlybackups.AnadministratordeletestheGroupsOUYouneedtorestoretheGroupsOUwithoutaffectingusersandcomputersintheSalesOUWhatshouldyoudo（）A.PerformanauthoritativerestoreoftheSalesOU.B.PerformanauthoritativerestoreoftheGroupsOU.C.Performanon-authoritativerestoreoftheGroupsOU.D.Performanon-authoritativerestoreoftheSalesOU.