Cer-tech.comhasaWindowsServer2008servernamedSYouhaveinstalledWebServer（IIS）serverroleonSTheserverhasanSMTPgatewaythatconnectstotheinternet.YouhaveaninternalfirewallinstalledonthenetworkwhichpreventsallclientmachinesfromestablishingaconnectiontotheinternetexcepttheSMTPgatewayoverTCPport25.YouconfiguretheSMTPgatewaytorelaye-mailforSWhatshouldyoudotoconfigureawebsiteonS1tosendemailtointernetusers？（）
A.InstallandconfigureSMTPserverfeatureonS1
B.ConfiguretheSMTPemailfeatureforthewebsiteonS1
C.CreateaDNSserveronS1andconfiguretheSMTPmailservice
D.CreateanMXrecordfortheSMTPgatewayonaninternalDNSserver
E.Noneoftheabove
参考答案：B
