You need to create a Power Apps portal app. Your Power Platform environment contains the Power Apps and Microsoft Dynamics 365 engagement apps. The new portal should help your customers and partners interact with experts, participate in forums, read the blogs and provide feedback. 
What type of template would you consider using for the portal?

Answer options:

A.Starter portal
B.Partner portal
C.Customer self-service portal
D.Community portal
E.Customer portal

Correct Answer: D 
Power Platform Power Apps provides users the portal templates to create a web portal with no coding. By default, users can use the Dataverse Starter portal template. 
If your organization has installed the Microsoft Dynamics 365 engagement apps, like Microsoft Dynamics 365 Sales or Dynamics 365 Service, you have a selection of five additional templates: Community portal — this template is for partners and customers that can communicate with experts, participate in forums, blogs and provide feedback.
Customer self-service portal — this template is for partners and customers that can submit problems, search a knowledge base, and participate in the forums.
Employee self-service portal — this template is for the employees that can use a knowledge base and submit problems.
Partner portal — this template is for the partners to work with accounts and opportunities.
Customer portal — this template is for the customers of the Dynamics 365 Supply Chain Management system.
All other options are incorrect. 
For more information about Power Apps portal templates, please visit the below URLs: 

https://docs.microsoft.com/en-us/learn/modules/introduction-power-apps-portals/03-get-started-portals
https://docs.microsoft.com/en-us/powerapps/maker/portals/portal-templates