Construction Planning and Management
In time-cost optimization of a project, crashing is done.

On original critical activities and those that become critical at any stage of crashing in the order of ascending cost slope
On all the activities lying on the critical path
On all the activities
Only on activities lying on the original critical path and having flatter cost slopes

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Construction Planning and Management
If the optimistic time, most likely time and pessimistic time for activity A are 4, 6 and 8 respectively and for activity B are 5, 5.5 and 9 respectively, then

expected time of activity A is greater than the expected time of activity B
expected time of activity B is greater than the expected time of activity A
expected time of both activities A and B are same
None of these

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