You create a Power Apps Employee self-service portal and need to add a Power BI dashboard. 
What type of Portal-Power BI integration should you enable?

Answer options:

A.Embedded service
B.Document sharing
C.Visualization
D.Maintenance mode

Correct Answer: C 
If you need to add a Power BI report and dashboard to the Power Apps portal web page, you need to enable one of the Power BI integration options: Power BI visualization — embeds a published report and dashboard within the webpage for anonymous and authenticated users.
Power BI Embedded services — shares embedded reports or dashboards created in a new Power BI workspace with the external users without Power BI license or Azure AD authentication.
When you create a Power Apps Employee self-service portal, only the authenticated users can use it. Suppose you need to share a published report or dashboard on a portal`s webpage. In that case, you should enable the Power BI visualization option (Number 3) in the PowerApps Portals admin center (Number 1) under the "Set up Power BI integration" menu item (Number 2). 
After you enable this option, you can add the Power BI component to a portal’s web page and configure the report’s or dashboard’s information between Liquid tags in the Studio source editor. 

All other options are incorrect. 
For more information about Power BI and Power Apps portal integration, please visit the below URLs: 

https://docs.microsoft.com/en-us/learn/modules/portals-integration/3-power-bi
https://docs.microsoft.com/en-us/powerapps/maker/portals/admin/set-up-power-bi-integration