This is an example of a parametric estimate. This estimate type uses a parameter, such as four hours of painting per hotel room, and multiplies this value across the total number of units, such as 1,500 rooms. A parametric estimate is an estimate that uses a parameter to predict the costs of the project, such as cost per network drop or cost per software license. Parametric estimating technique utilizes the statistical relationship that exists between a series of historical data and a particular delineated list of other variables.

Answer option C is incorrect. An analogous estimate type uses a similar project's duration as a basis for the current project's estimate duration.

Answer option B is incorrect. A definitive estimate type accounts for the duration or costs of each work package in the WBS.

Answer option D is incorrect. A bottom-up estimate, also known as a definitive estimate, accounts for the duration or costs of each work package in the WBS.