Please study the project network in Figure 1. Activity times are estimates in we

Please study the project network in Figure 1. Activity times are estimates in weeks. (a) What is the estimated project completion time?(b) List the critical path activities. (c) Suppose the original estimates are treated as most likely. The optimistic and pessimistic time estimates are assumed to be 1 week less and 1 week more respectively than the most likely estimate. Find a reasonable time estimate for the project completion time with a brief explanation of your definition of reasonable.