Consider a network with the data shown below: (13 points) Activity Normal Time Normal Cost Crash Time Crash Cost Crash Cost/wk COA B D E 5 weeks 8 7 3 3 $8,000 $8,000 $9,000 $5,000 $5,000 4 weeks 6 4 1 2 $8,500 $10,000 $15,000 $5,800 $6,500 $500 $1,000 $2,000 $400 $1,500 (a) Activities A, B, and E are critical path activities. In order to shorten the time duration of the project, which activity should be "crashed" first, assuming cost is important? Why? (b) If we crashed Activity B by two weeks, which of the following statement is most correct and why? bl. The project's schedule will be reduced by two weeks The available slack on the non-critical paths will increase b3. A new critical path may appear after the crash b4. All of the above b5. bl and b2 only b2