Multiple choice

For a particular project eight activities are to be carried out. Their relationships with other activities and excepted durations are mentioned in the table below:

Activity| Predecessors| Duration (days)| | a| -| 3| | b| a| 4| | c| a| 5| | d| a| 4| | e| b| 2| | f| d| 9| | g| c, e| 6| | h| f, g| 2|

If the duration of activity f alone is changed from 9 to 10 days, then the

  1. critical path remains the same and the total duration to complete the project changes to 19 days

  2. critical path and the total duration to complete the project remain the same

  3. critical path changes but the total duration to complete the project remains the same

  4. critical path changes and the total duration to complete the project changes to 17 days
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