YourcompanyhasanActiveDirectoryforest.TheforestcontainstwositesnamedSite1andSite2.Youplant

YourcompanyhasanActiveDirectoryforest.TheforestcontainstwositesnamedSite1andSite2.YouplantodeployExchangeServer2010serversinbothsites.Youneedtoplanahigh-availabilitysolutionfortheMailboxserversthatmeetsthefollowingrequirements：.Usersmustbeabletoaccesstheirmailboxesifasingleserverfails.UsersmustbeabletoaccesstheirmailboxesremotelyifasinglesitebecomesunavailableWhatshouldyoudo？（）

A.DeploytwoMailboxserversineachsite.Installandconfigurecontinuousclusterreplication（CCR）.

B.DeployoneMailboxserverinSite1andoneMailboxserverinSite2.Installandconfigurecontinuousclusterreplication（CCR）.

C.DeploytwoMailboxserversineachsite.Createonedatabaseavailabilitygroup（DAG）namedDAG1.AddallMailboxserverstoDAG1.

D.DeploytwoMailboxserversineachsite.Createtwodatabaseavailabilitygroups（DAGs）namedDAG1andDAG2.AddtheMailboxserversfromSite1toDAG1andtheMailboxserversfromSite2toDAG2.