Here are the precedence requirements, normal and crash activity times, and normal and crash costs for a project: Required time (weeks) Normal Activity Crash Expediting Cost/week Preceding activity None A A 11 Q7 5 3,000 2,000 2,000 2.000 4,500 2,500 BC8 19 Under normal activity time, the critical path is and the project completion time is weeks. The slack times of activity B, C, and D under normal activity time are respectively. In order to shorten the entire project by 6 weeks, we should first shorten activity weeks and then activity dollars. weeks with a total expediting cost of