Which of the following is the MAIN difference between bottom up and top down cost estimation?
A. Bottom up leads to a more accurate cost estimate than top down because it is performed by subject matter experts
B. Top down leads to a more accurate cost estimate because it is performed by upper management with direct access to budget information
C. Bottom up leads to a less accurate cost estimate because it is breaks down the task into smaller subtasks where some tasks may not have a cost
D. Both top down and bottom up are equally accurate estimation of a project’s total cost because they both refer to resources assigned by the project sponsor
