You work as a Web Developer at Certkiller.com. You create a Web application using MicrosoftASP.NET 3.5.  The Web application is hosted on a Web farm. The Web farm consists of three Web servers. Youshould configure the Web application for session state in order to meet the following requirements： * The session state data should not be lost if a server fails. * The session state should be maintained across browser requests by the same user.  You need to configure the Web.config file to meet these requirements.  What shuld you do？（）

• A、A
• B、B
• C、C
• D、D