Which of these is true for prototypes?

• A. Horizontal Prototypes does some processing apart from the required for presenting the product‚Äö√Ñ√∂‚àö√ë‚àö¬•s user interface
• B. Vertical Prototype realizes part or all of a product‚Äö√Ñ√∂‚àö√ë‚àö¬•s user interface
• C. All of the mentioned
• D. None of the mentioned