Which of the Following Is Not True of a Hierarchy

Which of the following is not true of a hierarchy in an Excel Data Model?

A) Only one hierarchy per table is allowed.For example,it wouldn't be possible to create the hierarchy Continent,Country,Region,City and the hierarchy Continent,Country,State/Province,City,Zip based on a Geography table.
B) A hierarchy must be created in the Power Pivot window.
C) A hierarchy is often aided by DAX's RELATED function,so that fields from related tables can be brought into a single table and used in building the hierarchy.
D) A hierarchy's main use is to allow users to drill down through the hierarchy in a pivot table.