45. 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 project characteristics (or parameters) in a mathematical model to predict costs.

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