The Earliest finish time (EF) is the earliest time by which a specific activity can be completed; it is calculated "by adding the activity’s estimated duration to the activity’s earliest start time: EF = ES + Estimated Duration."
This is because to know the Earliest finish time, one needs to have the Estimated duration or completion time of the project.
Then, the Estimated Duration would the added to the Earliest Start time to get the Earliest Finish Time.
This is based on the Critical Path method of determining the project duration.
Hence, in this case, it is concluded that the correct answer is option D.
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