You create a new ASP.NET MVC 2 Web application. The following default routes are created in the Global.asax.vb file.01 Shared Sub RegisterRoutes（ByVal routes As RouteCollection）02  03 routes.IgnoreRoute（"{resource}.axd/{*pathInfo}"）04  05 routes.MapRoute（ "Default"， "{controller}/{action}/{id}"， New With {.controller = "Home"， .action = "Index"， .id = ""}）  06 End Sub  You implement a controller named HomeController that includes methods with the following signatures.Function Index（） As ActionResult  Function Details（ByVal id As Integer） As ActionResultFunction&
A、Replace line 05 with the following code segment. routes.MapRoute（ "Default"， "{controller}/{action}/{id}"， New With {.controller = "Home"， .action = "DetailsByUsername"， .id = ""}）
B、Replace line 05 with the following code segment. routes.MapRoute（"Default"， "{controller}/{action}/{username}"， New With {.controller = "Home"， .action = "DetailsByUsername"， .username = ""}， New With {.username = "\w{3，20}"} ）
C、At line 04， add the following code segment.routes.MapRoute（ "Details byUsername""{username}"， New With {.controller = "Home"， .action = "DetailsByUsername"}， New With {.username = "\w{3，20}"}）
D、At line 04， add the following code segment. routes.MapRoute（ "Details by Username"， "{id}"， New With {.controller = "Home"， .action = "DetailsByUsername"}， New With {.id = "\w{3，20}"} ）
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