Construction Planning and Management
In the given figure, the network of a project represents

Activity of an excavation of a footing
Activity of an excavation which starts at event No. 1 and ends at even No. 2
None of these
Activity of excavation which takes 8 units of time

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Construction Planning and Management
Earliest finish of an activity is always

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

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Construction Planning and Management
Total float for any activity is defined as the difference between

Its latest start time and earliest start time
Its earliest finish time and earliest start time for its successor activity
Its latest start time and earliest finish time
Its latest finish time and earliest start time for its successor activity

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