A project has six activities (A to F) with respective activity

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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 path A-B, C-D and EF. All the activities can be crashed with the same crash cost per day. The number of activities that need to be crashed to reduce the project duration by 1 day is

1. 1
2. 2
3. 3
4. 6

Correct Option: C

Minimum number of activity to be crashed = 3
∴ All three are critical path.