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