The correct answer is: A. Default.aspx
The Default.aspx page is the first webpage added to an application. It is the default page that is loaded when a user visits the application’s URL. The Default.aspx page can be used to display a welcome message, provide links to other pages in the application, or perform other tasks.
The Home.aspx page is a common name for the default page of an application. However, it is not the only possible name. The default page can be named anything, but it is typically named Default.aspx.
The Index.aspx page is another common name for the default page of an application. However, it is not the only possible name. The default page can be named anything, but it is typically named Default.aspx.
The Start.aspx page is not a common name for the default page of an application. It is more likely to be the name of a page that is used to start a process or application.
In conclusion, the correct answer is: A. Default.aspx