Which datasets are supported for live connections in Power BI?

The correct choice focuses on the types of datasets that are capable of establishing live connections in Power BI. Specifically, SQL Server Analysis Services (SSAS) Tabular and Multi-Dimensional models are designed for direct querying, enabling users to interact with data in real-time without needing to import it into Power BI. This feature is crucial for scenarios where up-to-date data is paramount, such as in dynamic reporting and dashboards that require the latest information.

The Power BI Service is also included in the correct answer, as it allows direct connections to datasets published in the cloud, facilitating collaboration and ensuring users are always accessing the most recent data without the delays associated with data refreshes.

In contrast, the other provided options consist of datasets that do not support live connections. Excel files, CSV files, and other similar file types typically require data to be imported into Power BI for analysis, limiting the real-time interactivity that live connections afford. Therefore, understanding the nature of live connections and the environments they can operate within is essential for effectively utilizing Power BI's capabilities for real-time data reporting and analysis.