Activity Time (weeks) Cost (thousands) Time (weeks) Cost (thousands) 1-2City Center 3 6 5 4 1-3 City northeast 1 5 5 3 2-4 City South 5 7 10 4 3-4 City Southeast 2 6 7 4 2-6 City West 2 5 6 3 4-6 County East 5 9 11 6 4-5 County North 4 6 6 3 6-7 County South 1 4 5 2 5-7 County West 1 5 4 2 A) Find the all-normal schedule and cost B) Find the all-crash Schedule and cost C) Find the total cost required to expedite all activities from all-normal (case a) to all-crash (case b). D find the least cost plan for the all-crass time schedule. Start from the all-crash problem (b). Assume partial crashing. Any help would be greatly appreciated.