Please include detailed calculations and explanations. Need answer ASAP. Thank you

a) A project has the following information. Draw a network diagram for this project and analyse it using 1) forward and backward pass method, 2) critical path method. Analyise critical and non-critical activities. Determine the project completion time. Duration (weeks) 7 12 Activity 1-2 2-3 2-4 3-4 4-5 ID A B C D E Predecessor None (1-2) A (1-2) A (2-3) B (2-4) C, (3-4) D 22 11 6 b) Using the same information, the following is the normal and crashing time and the normal and crashing cost. Activity ID A B 1-2 2-3 2-4 3-4 4-5 Time Cost Normal Crashing Normal Crashing 7 6 15,000 18,000 12 9 11,000 14,000 22 21 18,500 19,000 11 10 8,000 9,000 6 5 4,000 4,500 C D E Analyse possibility of crashing for that project and determine the least project completion time. Note: you may add assumption or other relevantecessary information for that project. Based on the result, why this project cannot be crashing for more than one time? Explain your argument