You work as a Web Application Developer for ABC Inc.

You work as a Web Application Developer for ABC Inc. The company uses Visual Studio .NET as its application development platform. You are creating a Web application using .NET Framework 2.0. The application will be used in Local Area Network (LAN). The Web application reads comma enclosed text files. The text files exist in a subdirectory under the Web application's root directory. You must ensure that users never directly navigate to these files in a Web browser if they are not members of the Accounting role. You are required to write an ASP.NET HTTP handler that will use the FileAuthorizationModule class. Which of the following forms of authentications will you use?