Which dimension type cannot have attributes assigned to it?

The reason the chosen answer is correct is that hierarchical dimensions are designed to represent a structured organization, usually consisting of levels or tiers that depict relationships between entities, such as geographic regions or organizational structures. Given this inherent structure, hierarchical dimensions rely on the parent-child relationships to convey their meaning and operational context rather than attributes, which are often used to describe individual entities or to provide additional information about them.

In contrast, associated dimensions can link to other dimensions and often have attributes to enhance their functionality. Grouped dimensions are used to categorize items and can also have attributes for further detailing. Flat dimensions are simple and generally represent data without any hierarchy, often allowing for attributes to clarify their characteristics. Each of these dimension types benefits from the use of attributes to provide more context and richness to the data they represent, making hierarchical dimensions the outlier in this regard.