You have a Web server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). Server1 hosts one Web site. You create a second Web site that hosts a third-party Web application named App1. The vendor of the third-party application states that the application does not support host headers. You need to ensure that users can access both Web sites. What should you do?（）
- A Enable WebDAV.
- B Enable Server Side Includes.
- C Configure both Web sites to use different IP addresses.
- D Configure both Web sites to use different application pools.