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You have a project with four activities as follows. Activity 1 can start immediately and has an estimated duration of 1. Activity 2 can start after activity 1 is completed and has an estimated duration of 4. Activity 3 can start after activity 2 is completed and has an estimated duration of 5. Activity 4 has an estimated duration of 8. It can start after activity 1 is completed. Both activity 3 and activity 4 must be completed before the project is complete. What is the critical path of the project?
A. Start, 1, 2, 3, End
B. Start, 1, 4, 3, End
C. Start, 1, 4, End
D. Start, 1, 2, 3, 4, End

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