YourcompanyhasanExchangeServer2010HubTransportservernamedHubHub1receivesalle-mailsenttothecompanyfromtheInternet.Youinstalltheanti-spamagentsonHubYouneedtoensurethatHub1onlyacceptsmessagessenttoe-mailaddresseslistedinActiveDirectory.Whatshouldyoudo？（）
A.ModifythepropertiesoftheSenderFilteringagent.
B.ModifythepropertiesoftheRecipientFilteringagent.
C.ModifythepropertiesofthedefaultAcceptedDomain.
D.ModifythepropertiesofthedefaultReceiveConnector.
参考答案：B
