Which method of viewing Extensibility requires varying Cube Dimensions by Scenario Type?

Horizontal Extensibility is the method of viewing Extensibility that requires varying Cube Dimensions by Scenario Type. This approach allows for the expansion of dimensions across different scenarios within the cube, enabling users to tailor the data model according to specific business needs or scenarios. By adding additional dimensions based on the scenario, Horizontal Extensibility facilitates a more adaptable structure that can accommodate changing requirements and enhance reporting capabilities.

This is particularly beneficial in environments where scenarios may differ significantly—such as budgeting, forecasting, or actuals—because it allows for distinct dimensions and measures to be applied to each scenario, making the analysis more relevant and accurate. This adaptability is a key aspect of ensuring that the data cube remains useful and focused on the organization's evolving analytical and reporting landscape.

In contrast, the other methods like Vertical Extensibility, Fixed Extensibility, and Composite Extensibility have different focuses, such as adding additional measures, maintaining a consistent structure, or combining different data models, respectively, and do not specifically target the variation of cube dimensions by scenario type.