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

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

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Construction Planning and Management
Earliest finish of an activity is always

Greater than or equal to earliest event time of the following node
Greater than earliest event time of the following node
Less than earliest event time of the following node
Less than or equal to earliest event time of the following node

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