A network diagram is drawn using AOA $($activity on arrow$)$ format to analyze the schedule:

Calculate ES$,$ EF$,$ LS$,$ LF and Slack for all activitics.

a$)$ How long is the project duration?

b$)$ If all activities are on schedule and then activity $"$b$"$ is delayed by $2$ days, what is your new estimate on total project duration?

c$)$ If all activities are on schedule and then activity $"$e$"$ is delayed by $2$ days, what is your new estimate on total project duration?