To answer this question, you need to understand the different types of Delphi estimation techniques.
Option A) Narrow band Delphi - This option is incorrect because narrow band Delphi is a variation of the Delphi technique that involves a smaller group of experts providing estimates.
Option B) Wide band Delphi - This option is correct because wide band Delphi is another name for expert-based test estimation. It involves a larger group of experts providing estimates, which helps to reduce bias and improve the accuracy of the estimation.
Option C) Bespoke Delphi - This option is incorrect because bespoke Delphi is not a commonly used term in the context of test estimation.
Option D) Robust Delphi - This option is incorrect because robust Delphi is not a commonly used term in the context of test estimation.
The correct answer is B) Wide band Delphi. This option is correct because wide band Delphi is another name for expert-based test estimation.