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A project has six activities (A to F) with respective activity durations 7, 5, 6, 6, 8, 4 days. The network has three paths A-B, C-D and E-F. All the activities can be crashed with the same crash cost per day. The number of activities that need to be crashed to reduced the project duration by 1 day is                                  

      (a) 1                                                                    (b) 2                   

      (c) 3                                                                    (d)  6

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