Active Model 7.1, Gantt Chart, appears in MyOMLab. It allows you to evaluate the sensitivity of the project time to changes in activity times and activity predecessors. In this exercise we use the data from Example 7.2 to develop a Gantt chart.QUESTIONS1. Activity B and activity K are critical activities. Describe the difference that occurs on the graph when you increase activity B versus when you increase activity K.2. Activity F is not critical. Use the scroll bar to determine how many weeks you can increase activity F until it becomes critical.3. Activity A is not critical. How many weeks can you increase activity A until it becomes critical? What happens when activity A becomes critical?4. What happens when you increase activity A by one week after it becomes critical?5. Suppose that building codes may change and, as a result, activity C would have to be completed before activity D could be started. How would this affect the project?