You create a new ASP.NET MVC 2 Web application.
The following default routes are created in the Global.asax.cs file. (Line numbers are included for reference
only.)
01 public static void RegisterRoutes(RouteCollection routes)
02 {
03 routes.IgnoreRoute(“{resource}.axd/{*pathInfo}”);
05 routes.MapRoute(“Default”, “{controller}/{action}/{id}”, new {controller =
“Home”, action = “Index”, id = “”});
06 }
You implement a controller named HomeController that includes methods with the following signatures.
public ActionResult Index()
public ActionResult Details(int id)
public ActionResult DetailsByUsername(string username)
You need to add a route to meet the following requirements.
The details for a user must to be displayed when a user name is entered as the path by invoking the
DetailsByUsername action.
User names can contain alphanumeric characters and underscores, and can be between 3 and 20
characters long.
What should you do?

A.
Replace line 05 with the following code segment.
routes.MapRoute(“Default”, “{controller}/{action}/{id}”, new {controller =
“Home”, action = “DetailsByUsername”, id = “”});

B.
Replace line 05 with the following code segment.
routes.MapRoute(“Default”, “{controller}/{action}/{username}”, new {controller
= “Home”, action = “DetailsByUsername”, username = “”}, new {username = @”\w
{3,20}”});

C.
At line 04, add the following code segment.
routes.MapRoute(“Details by Username”, “{username}”, new {controller = “Home”,
action = “DetailsByUsername”}, new {username = @”\w{3,20}”});

D.
At line 04, add the following code segment.
routes.MapRoute(“Details by Username”, “{id}”, new {controller = “Home”,
action = “DetailsByUsername”}, new {id = @”\w{3,20}”});