Project Management Professional Practice Question

The Early Finish (EF) of an activity is determined by its Early Start (ES) plus its duration minus one. To calculate ES for Activity D, you need to find the completion times of its predecessors (Activity B and Activity C). The ES for Activity B is 4 days (3 days + 1) and its EF is 8 days (4 days + 5 - 1). Similarly, the ES for Activity C is 4 days (3 days + 1) and its EF is 5 days (4 days + 2 - 1). Thus, the ES for Activity D would be 9 days (max EF of B or C +1). Therefore, EF for Activity D is calculated as 12 days (10 days + 4 - 1).