Discussion
The critical path of a network is
Answer: D
The critical path of a network is the longest time path through it, since the project cannot be completed in less time than the longest chain of activities. So (D) is the key. The shortest path in (B) is wrong because it would not fix the project time. Options (A) and (C) describe a zero slack on the activities of that path, and are the results of it, but they are not the definition of the path. A delay in an activity on that path delays the whole project, whereas activities not on it have slack. The path is found by a forward pass and a backward pass over the network.
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