Construction Planning and Management
Latest start of an activity is always

greater than or equal to latest event time of preceding node
equal to latest event time of preceding node
less than latest event time of preceding node
less than or equal to latest event time of preceding node

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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
Only on activities lying on the original critical path and having flatter cost slopes
On all the activities lying on the critical path
On all the activities

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