You are creating an ASP.NET application by using the .NET Framework 3.5.

You need to ensure that the application meets the following requirements:

* The layout that must be applied to the pages in the application can be selected by the developers.
* The layout of the pages can be modified by the developers without the source code modification.
* A consistent page layout is maintained.

What should you do?

A.
Create multiple themes for the application. Specify a theme for the application in the Web.config file.

B.
Create multiple master pages for the application. Specify the master page for the
application in the Web.config file.

C.
Create a master page that uses multiple Web Part zones. Disable membership and personalization for the application.

D.
Ensure that all pages use multiple Web Part zones. Enable membership and
personalization for the application.