Which tool in Power Query is used to reshape data by flipping its dimensions?

The tool in Power Query that reshapes data by flipping its dimensions is indeed the option that focuses on transposing the dataset. When using the Transpose operation, Power Query switches rows into columns and columns into rows, effectively altering the structure of the dataset. This can be especially useful when you want to change the orientation of your data, making it easier to analyze or visualize in a desired format.

In this context, Transpose is specifically designed for such dimensional adjustments. It allows users to manipulate the way data is organized without altering the underlying values. For instance, if you have a dataset where each row represents a different category and each column represents a date, transposing it would change that arrangement so that dates become rows and categories become columns.

Other options, while related to reshaping data, serve different purposes. Pivot transforms unique values from one column into multiple columns while aggregating data in others. Unpivot does the opposite, taking multiple columns and converting them into a single column of values, thus flattening the structure. Transform typically refers to a broader category of functions for modifying data but does not specifically deal with the direct flipping of dimensions. Therefore, the transposing option is the most accurate choice for the specific operation described.