Provide solution with proper Explanation...

1 - Suppose you are running a project for new product development. The product is going to be using 2 sub-materials. The following activities with respective precedency relations and times are given. Activity Precedency Duration relationship (week) A-Defining the characteristics of the product to be developed. 16 B- Designing the product 14 C- Defining raw material and sub- materials and issuing the order A 12 D- Receiving the materials and manufacturing the prototype B,C 16 E-Assembling the sub materials D 2 F- First assessment and acceptance E When Activity C and Activity d are both delayed 1 weeks. Which one of the following is true? a) Earliest Finish time Activity C does not change but total completion time of project becomes 20. b) Total completion time of the project becomes 19 weeks and Earliest finish time of Activity C is 9. c) Critical path changes and activity C also becomes critical. d) Total completion time of the project becomes 20 and earliest finish time of Activity C becomes 9. e) Earliest Finish time Activity C does not change but Activity D becomes 17 respectively