a G 3. [20 points) A landscaping upgrade project consists of following activities. Times are given in weeks. Activity Description Immediate Predecessors Normal Time (weeks) order materials none 4 b. clear job sites none 6 excavate job sites b 10 d. make trenches for conduit b 6 install conduit 10 t. form and pour foundations a, 8 B install wire f 6 h. install lighting standards B 5 install luminaries h 4 e. ad a. Draw the network diagram. If you drew on a paper, scan and insert into the document. b. Calculate the ES, EF for each activity. c. Construct an early start-date Gantt chart for the project. What is the project completion time? d. Which activities can be delayed without affecting the project completion time