a. The network diagram, including normal activity times, for this procedure is shown in Figure 7.9. Keep the following points in mind while constructing a network diagram.1. Always have start and finish nodes.2. Try to avoid crossing paths to keep the diagram simple.3. Use only one arrow to directly connect any two nodes.4. Put the activities with no predecessors at the left and point the arrows from left to right.5. Be prepared to revise the diagram several times before you come up with a correct and uncluttered diagram.b. With these activity durations, the project will be completed in 19 days and incur a $700 penalty. Determining a good completion date requires the use of the minimum-cost schedule procedure. Using the data provided in Table 7.2, you can determine the maximum crash-time reduction and crash cost per day for each activity. For example, for activity A