When an unusual amount of uncertainty surrounds a project, we use Select one: a. Top-down approach b. Phase Estimating c. Bottom-up approach d. Range Estimating Top - down approach is used for time and cost estimating when Select one: a. Fioed - price centract b. Customer wants details c. Unstable scope d. Cost and time are important Time-Constrain and Cost - Acceptable means Select one: a. Time is optimized, cost overnun/under run is not acceptable b. Time is foxed, cost can be optimized c. Time is fixed, cost ovemun/under run is acceptable d. Time is fixed, cost is fixed The lowest level of work break down structure is called Select one: a. Work Package b. Lowest Deliverables c. Work Accounts d. Deleverables