The value proposal seems a central concept for Lean Startup:

a. And it is valued as much as in the conventional way of innovating a business model.

b. But it needs to be complemented by other elements, such as partners, supply chain components, which are secondary to it.

c. Not really. The value proposal would appear relevant depending on the type of valueholder group that drives the stage of creation of the new business model.

d. None of the above is valid.