According to Kerzner, H. (2017). Project Management: A Systems Approach to Planning, Scheduling, and Controlling. (12th edition), answer the below question: Use the below two tables for a given project to answer the question below. Table 1 Activity Duration Develop 10days First pass of testing 5days Retest 5days Fix defects 5days Contingency 5 days Testing completed 0 days Table 2 Description Contingency server price increase 1000 Contingency XYZ not needed (positive) -3000 0 0 Contingency for estimating error 3600 QUESTION: What types of contingencies appear in the tables? What is the difference between the two? When is it required that each be used