You work as the IT professional in an international company which is named Wiikigo. You are experiencedin implementing and administering a network operating system. You are specialized in deploying servers，configuring Windows Server 2008 Terminal services and network application services， and configuring aweb services infrastructure. You have a server named S01 that runs Windows Server 2008. The server hasthe Web Server （IIS） server role installed. You have an SMTP gateway that connects to the Internet. Theinternal firewall prevents all computers， except the SMTP gateway， from establishing connections overTCP port 25. You have the SMTP gateway configured to relay e-mail for S01. You have to configure aWeb site on S01 to send e-mail to Internet users. What action should you perform？（）

An MX record for S01 should be created on an internal DNS server.
B. An MX record for the SMTP gateway should be created on an internal DNS server.
C. The SMTP Server feature should be installed on S01.
D. The SMTP E-mail feature for the Web site should be installed on S01.