The "Catalytic Cracker Design" project has the following activities, predecessors, and required number of engineers: Project: Catalytic Cracker Design Activity A B D E F G Predecessors B D E Duration (weeks) 6 8 2 5 9 Process Engineers 3 3 3 2 If the project team is made of only 9 Process Engineers, which activities need to be delayed (and how long) to meet this requirement without affecting the project completion date? O Delay activity F by 2 weeks Delay activity A by 2 weeks Delay activity D by 1 week O Delay activity D by 2 weeks