Given: The table shown below, which lists the normal and crash durations, and for a project, comprising of seven activities, and the network diagram for said project. All durations are in days, and all costs are in dollars. The network diagram for the project is also shown below. Required: Determine a) The critical path: b) The normal duration and the normal cost of the project; and c) By how many days can this project be crashed, and at what cost