You have a server named Server1 that runs Windows Server 2003 Web Edition Service Pack 2 (SP2). You create a new virtual directory named App1. App1 contains a Web application. Users report that when they enter http://app1 in their Web browsers, they are unable to connect to the Web application. You need to ensure that users can access the Web application when they connect to http://app1. What should you do? （）

• A、Move the content of the Web application to C:/App1. Change the home directory for App1.
• B、Move the content of the Web application to C:/App1. Change the application pool for App1.
• C、Remove the App1 virtual directory. Create a new Web site, and then configure the Web site to use port 8080. In DNS, create a Host record for App1.
• D、Remove the App1 virtual directory. Create a new Web site, and then configure the Web site to use a host header of App1. In DNS, create a Host record for App1.