Which of the following are building blocks of Power BI? Tiles and visualizations.Semantic models and visualizations.Semantic models and reports.

Semantic models and visualizations, as well as semantic models and reports, are the building blocks of Power BI. Tiles and visualizations are components that can be added to reports, but they are not considered fundamental building blocks.

Here's a step-by-step breakdown:

1. Semantic Models: These are the data models that you create in Power BI. They define the relationship between different data sources and tables, and also include measures, calculated columns, hierarchies, etc. They are the foundation of any Power BI project.

2. Visualizations: These are the graphical representations of your data. Power BI offers a wide range of visualizations, including charts, graphs, maps, and more. You can customize them to highlight specific data points or trends.

3. Reports: These are collections of visualizations, tables, and other data that provide a consolidated view of business data. Reports are highly interactive and customizable in Power BI, and you can publish them to the Power BI service for others to consume.

4. Tiles: These are single visualizations, usually part of a dashboard, that represent a report or data from a report. They are not considered a building block of Power BI, but rather a component of a report or dashboard.