Which of the following Provides the least accurate in estimating?

Which of the following Provides the least accurate in estimating?

A.
Rough order of magnitude

B.
Budget estimate

C.
WBS estimate

D.
Definitive estimate

Explanation:
Rough Order of Magnitude (ROM) Estimate

A rough order of magnitude (ROM) estimate is the least accurate estimate. ROMs are -50% to +50% accurate, or potentially even larger. ROMs are used very early in the project when there is limited information from which to develop an accurate estimate.