Linda, the project manager at the City of Mississauga, is currently estimating the costs for completing the activities outlined in level 1.3 of the WBS. This level consists of three activities crucial for budget estimation. Drawing from her experience in similar projects, Linda has gathered optimistic, most likely, and pessimistic cost estmates for each activity, which are summarized in the table below Activity ID 131 1.3.2 1.3.3 Optimistic $735 $850 $1450 Most Likely $890 $1150 $2.035 a) What is the total cost of the 1.3 level of the WBS? (3 marks) b) Which estimating technique is Linda using? (1 marks)