Hi Ledio,
if you want to know which method you can use to generate applications from an IFML model, the answer is very easy: whatever you want.
In fact, IFML doesn't have any constraints in terms of modeling tools architecture and code generation. So you can choose to build the generators with any of these strategies.
If the question is "which strategy WebRatio Platform use", the answer is something similar to (a).
Best Regards,
Davide