Respuesta :
Answer:
When system feasibility is being determined
Explanation:
Prototyping is the part of Requirement and Analysis phase. It is the phase where the client and the development team sits and discuss about what the requirement is and show a model of what are all the things which they could bring up the requirement as a software.
So here, the prototyping is really essential to visually understand how the team has interpreted the requirement and how far it matches with the client. All the other options stands invalid in the given context.