Tutorial1.Explain the difference between estimating activity durations and estimating the effort requiredto perform an activity.2.How does activity resource estimating affect estimating activity durations?3.Explain the following schedule development tools and concepts: Gantt charts, critical pathmethod, PERT, critical chain scheduling, and sprints.4.Consider the table below and answer the questions that follow. All duration estimates orestimated times are in days, and the network proceeds from Node 1 to Node 9.ActivityInitial NodeFinal NodeEstimated Duration