State whether True or False:

a. During resource levelling exercise, the critical activities are given priority for resource allocation.

b. Time-cost trade-off analysis in CPM tries to optimize the project duration to minimize the total project cost.

c. An activity with the highest cost slope is to be considered first for crashing.

d. When there is more than one critical path in a network, crashing an activity on any one path will reduce the project duration.

e. Resource levelling exercise uses activity floats to reschedule activities, without delaying project completion.