Ad team is a semester$-$long project. Interested students need meeting where the various tasks in the team project are allotted. A group researches competin products. Another group designs a survey to research customer demand; results of the survey then analyzed. After the research is done, an advertising campaign is created. Those students who will be presenting have to rehearse while the rest of the students give constructive feedb on their performance. Last of all is the presentation to a panel of judges. All these activities $h$ to be done in the following order:

$\backslash$table$[[$Activities$,$Immediate Predecessors,Time $($weeks$)],[$A$.$ Register,$-,3],[$B$.$ Meeting,A$,1],[$C$.$ Research competition,B$,3],[$D$.$ Survey,B$,2],[$E$.$ Analysis,D$,2],[$F$.$ Create ad campaign,C$,$E$,4],[$G$.$ Rehearse,F$,2],[$H$.$ Presentation,G$,1]]$

a$)$ Draw a project $($PERT$/$CPM$)$ network for the ad team project.

b$)$ Compute Early Start and Early Finish times for the activities in the project.

c$)$ Compute Late Finish and Late Start times for the activities in the project.

d$)$ Find the activities on the critical path.