Explanation/Reference:
Explanation:
According to the question, you have to use the estimating technique that has a higher degree of accuracy.
The most accurate estimating technique is bottom-up estimating. What is bottom-up estimating? Bottom-up is a cost estimating technique that involves estimating the cost of individual work packages or schedule activities with the lowest level of detail. The detailed cost is rolled up (or summarized) to higher levels for total project estimates. This summarized data is very useful for reporting and tracking purposes. Bottom-up estimating provides a higher degree of accuracy, provided the estimates at the work package level are accurate.
Incorrect Answers:
A, B, C: Parametric modeling and analogous estimating techniques use top-down estimation model. These are less accurate than the bottom-up estimation. What is analogous estimating? Analogous is an estimating technique that uses the values of parameter, such as scope, cost, budget, and duration or measures of scale such as size, weight, and complexity from a previous, similar activity as the basis for estimation of the same parameter for a future activity. It is a top-down estimating technique and is a form of expert judgment. It provides a lower degree of accuracy than other estimating techniques. This technique is primarily used when there is a limited amount of detailed information about the project or program. What is parametric modeling? Parametric modeling is an estimating technique that uses parameters, or project characteristics, to forecast project costs. It involves a top-down approach and is similar but more accurate than analogous estimating. It uses historical data and other variables to calculate an estimate for activity parameters, such as scope, cost, budget, and duration.