A Project Was Successfully Implemented for a Banking Customer

Multiple Choice

A project was successfully implemented for a banking customer.The team that worked on the project was deallocated on the closure of the project.However,the client came back after a couple of months with a few functionality changes and the company could not allocate the same set of developers back to the project.The new team of developers had a tough time understanding the existing code and functionalities.What could be the reason?

A) Prototype was missing and hence the new team had a tough time.
B) Proper documentation was missing that would have helped the new team understand the product better.
C) The system proposal was missing and the new team could not be briefed adequately about the product.
D) The feasibility study of the product was inadequate.