You modify an existing Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  You add a theme to the ASP.NET application.  You need to apply the theme to override any settings of individual controls.  What should you do？（）

• A、In the Web.config file of the application，set the Theme attribute of the pages element to the name of the theme.
• B、In the Web.config file of the application，set the StyleSheetThemeattribute of the pages element to the name of the theme.
• C、Add a master page to the application. In the @Master directive，set the Theme attribute to the name of the theme.
• D、Add a master page to the application. In the @Master directive，set the StyleSheetTheme attribute to the name of the theme.