You are a systems administrator responsible for managing a Windows Server 2008 Web Server Currently，there are no Web sites configured on the server. You need to configure the server to host two Web applications： Engineering App and Sales App. Both Web applications must be accessible by using HTTPport 80 without the use of host headers. Also， you must protect against problems in one Web applicationaffecting the performance or reliability of the other Web application. Which two steps should you take tomeet these requirements？（）

A. Create a single Web site that contains both Web applications.
B. Create two Web sites， one for each Web application.
C. Assign both Web applications to the same application pool.
D. Assign each Web application to its own application pool.