Estimate the duration of activity D using the PERT method, knowing that it has an optimistic time estimate of 11 days, a most likely estimate of 14 days, and a pessimistic estimate of 23 days. Draw a Network Diagram of this project (you can use drawings tool in Word or scan in your hand drawings as an image) Find the critical path and the shortest time to complete this project Calculate the ES, LS, EF, LF, and Slack time for each task in the network (you can enter such information into the boxes oftasks 0n the network dia gram) Activity Description Predecessors Duration A Identify product requirements 16 for the global market B Preliminary design of the product A 7 C Select fabrication plant in 15 another country D Evaluation of design B, C ?? E Prepare the contract with the A 12 supplier and the fabrication plant F Contract negotiation E 15 G Preparation of fabrication plant D, E 17 H Final design of the product F 10 Fabrication of product G 14 Testing of plant and product G, H 3 K Oversea shipment of product to J, I 13 owner