Which of the following is NOT a main component of Power BI?

The correct answer is B. Power BI Online is not considered a main component of Power BI. Instead, the main components include Power BI Desktop, Power BI Service, and Power BI Mobile.

Power BI Desktop is primarily used for creating reports and data models locally on a user's machine. Power BI Service refers to the cloud-based interface that allows for the sharing and collaboration of reports and dashboards. Power BI Mobile is the application that enables users to access reports and dashboards from their mobile devices.

Power BI Online might be a common phrase used casually to refer to features available in the Power BI Service, but it does not represent an official component of the Power BI suite. Understanding the distinctions between these components is crucial for effectively using Power BI in various environments and scenarios.