You install the Web Server （IIS） role on and the SMTP Server feature on a server that runs Windows Server 2008.  You need to configure the new SMTP server to forward mail to the mail server of the Internet Service Provider （ISP）. What should you do？（）

• A、Configure the smart host setting to use the local host.
• B、Configure the smart host setting to use the mail server of the ISP.
• C、Run the appcmd /delivery method：PickupDirectoryFromIis command.
• D、Configure the SMTP delivery setting to Attempt direct delivery before sending to smart host.