Which statement is true about Bottom-Up estimating?

A.
Estimating the cost of individual work items and then rolling up the costs to arrive at a project total

B.
Uses the actual cost of a previous similar project as the basis for estimating the cost of the current project

C.
Using the project characteristics (or parameters) in amathematical model to predict costs

D.
Cost of quality can also be used to prepare the schedule activity cost estimate