You are designing the architecture for the app.
You need to ensure that the logical design fulfills the design pattern requirements.
Which type of object should you create?

A.
C# class library

B.
Windows Runtime components

C.
A single JavaScript file

D.
A separate JavaScript file for each page that contains a single enterprise service provider implementation

Explanation:
Building your own Windows Runtime components to deliver great Metro style apps – Windows 8 app developer blog – Site Home – MSDN Blogs
Creating Windows Runtime Components in C# and Visual Basic