多项选择题 You create a Microsoft ASP.NET Web application by using the Microsoft .NET Framework version 3.5.  When you review the application performance counters， you discover that there is an unexpected increase in the value of the Application Restarts counter. You need to identify the reasons for this increase.  What are three possible reasons that could cause this increase？（）

单项选择题 You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. The application is deployed on a Microsoft IIS 6.0 Web server by using the default ASP.NET version 2.0 application pool and Windows Authentication.  The application contains functionality to upload files to a location on a different server. Users receive an access denied error message when they attempt to submit a file. You need to modify the Web.config file to resolve the error.  Which code fragment should you use？（）

单项选择题 You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. When you access the application in a Web browser， you receive the following error message： "Service Unavailable".  You need to access the application successfully.  What should you do？（）