Q:
You have been asked to customize the application using Visual Studio.

You need to create an extension model that will allow for future updates without affecting the core codebase.

What should you do?

A Create a new model, set the model's 'Layer' property to 'ISV', and add the necessary elements.
B Create a new model in the 'USR' layer and override the existing elements.
C Copy the entire 'SYS' layer to a new 'ISV' layer and make changes there.
D Modify the existing model directly in the 'SYS' layer.

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