Golden West Beverages Inc. is behind schedule in the implementation of a new accounting information system and management wants to get the project back on track for an on-schedule delivery. Which of the following represents the concept of "Brook's Law?
a. If timing and cost remain constant, the scope must decrease
b. Crashing tasks does not shorten the critical path
c. Additional resources provide decreasing marginal benefit
d. The schedule is extended, so resources work less