A Data Analyst is working with the following dataset.

The current view contains only one aggregated Discount mark for each Vendor, so Tableau does not have enough individual marks within each vendor partition to calculate a meaningful distribution. Adding Invoice Number to Detail increases the level of detail so that each invoice contributes an individual Discount mark while Vendor remains the grouping dimension. Tableau can then calculate quartiles, median, whiskers, and outliers from the underlying distribution. Tableau’s box-plot guidance lists a dimension on Detail as one of the fundamental building blocks of a box-and-whisker plot. Changing the whisker configuration would affect how an already valid distribution is displayed but would not create the missing observations. Count Distinct and converting Discount to discrete would alter the analytical meaning rather than establish the correct mark granularity. Therefore, B is correct.