_In the time-cost optimisation, using CPM method for network analysis, the crashing of the activities along the critical path is done starting with the activity having$?

_In the time-cost optimisation, using CPM method for network analysis,

1.	_In the time-cost optimisation, using CPM method for network analysis, the crashing of the activities along the critical path is done starting with the activity having$?
A.	Longest duration
B.	Highest cost slope
C.	Least cost slope
D.	Shortest duration
Answer» D. Shortest duration