you are developing an asp net mvc 2 web application that displays..., Appendix, ASP.NET

Question:You are developing an ASP.NET MVC 2 Web Application that displays daily blog posts. 
Visitors access a blog post page by using a Web address to pass in the year, month, and day -for example, contoso.com/2010/07/20.
The application must register the appropriate route to use the Display action of the blog controller. 
Only page visits with a four digit year, two-digit month and two-digit dat can be passed to the action. 
You need to ensure that the route is registered correctly, 

Which code segment should you add?

A routes.MapRoute("DailyBlogPosts", "{year}/{month}/{day}",
new {
controller="Blog",
action="Display",
   year=@"\d{4}",
   month=@"\d{2}",
   day=@"\d{2}"
   }); 
B routes.MapRoute("DailyBlogPosts", "{year}/{month}/{day}",
new {
controller="Blog",
action="Display",
        }
new {
        year=@"\d{4}",
       month=@"\d{2}",
       day=@"\d{2}"
    }); 
C routes.MapRoute("DailyBlogPosts", "{year}/{month}/{day}",
new {
controller="Blog",
action="Display",
         }
new {
year="yyyy",
month="mm",
day="dd"
   }); 
D routes.MapRoute("DailyBlogPosts", "{year}/{month}/{day}",
new {
controller="Blog",
action="Display",
year="yyyy",
month="mm",
day="dd"
   });

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A routes.MapRoute("DailyBlogPosts", "{year}/{month}/{day}", new { controller="Blog", action="Display", year=@"\d{4}", month=@"\d{2}", day=@"\d{2}" });

B routes.MapRoute("DailyBlogPosts", "{year}/{month}/{day}", new { controller="Blog", action="Display", } new { year=@"\d{4}", month=@"\d{2}", day=@"\d{2}" });

C routes.MapRoute("DailyBlogPosts", "{year}/{month}/{day}", new { controller="Blog", action="Display", } new { year="yyyy", month="mm", day="dd" });

D routes.MapRoute("DailyBlogPosts", "{year}/{month}/{day}", new { controller="Blog", action="Display", year="yyyy", month="mm", day="dd" });

B