Which of the following statements regarding time-cost tradeoffs in cpm networks is false? a. crashing shortens project duration by assigning more resources to critical tasks. b. crashing sometimes has the reverse result of lengthening the project duration. c. a negative crash cost per period would imply that either crashing is cheaper than not crashing or that the crash time was slower than the normal time. d. crashing must consider the impact of crashing an activity on all paths in the network. e. activities not on the critical path can become critical after crashing takes place.