D. Top-down estimate
A top-down estimate is based on past projects to predict the current cost and/or duration of the current project. It uses high-level information from similar previous projects to estimate the overall cost and schedule
I think D was selected as the answer in the context of estimating the current cost based on estimation performed early in the project life cycle when detailed information is limited and relies on high-level assumptions, analogous estimation, or historical data from similar projects.
Top Down: examining the components at a high level in a hierarchical
Breakdown. None of the options are correct.
Delphi estimation technique uses a combination of expert judgment and history.
Top down estimating approach deals with how long the project will take to completion then breaking them into various tasks.
Bottom up deals with estimating how long it take each sub task to complete
Top-down: examining the components at a high level in a hierarchical breakdown.
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