Consider a project with the following list of activity times, precedence relationships, and crashing costs. The manager wants to complete the project three weeks early in the cheapest way possible. What activities should be crashed to achieve this goal? Note: Please show your detailed work for this question in terms of your step-by-step crashing approach. You do NOT have to attach the network diagram. Extent of Activity Immediate Predecessor Duration (weeks) Crash cost per crashing week ($) (weeks) a 3 550 2 b a 6 400 2 C b 4 100 2 d a 3 250 2 e d 6 150 2 f c, e 4 300 2 0.0 g a 6 350 2 h g 5 150 2 f, h 8 500 2