The project team lead repeatedly uses the term "supply chain" whereas the project sponsor uses the term "value chain"and the project team is unclear about the difference in terms. When applying project procurement and partnering using Agile methods, which statement BEST describes value chain? a. All activities performed by project team or partners that help produce solution b. Agreement allowing customer to substitute future work packages c. Agreement to pay set amount for current increment of work d. Agreement by which a contractor makes more if completed early