You have a chatbot application that uses Azure QnA resource to answer questions in multiple languages. Given the global presence, you would want users from all regions to participate in improving the questions and answers in your knowledge database. This brings up the requirement to grant access to all users, for them to edit questions and answers. Since you control access through RBAC, which role would you choose per the requirement while maintaining minimum privileges for the task.

Answer options:

A.Owner
B.Contributor
C.QnA Maker Editor
D.Cognitive Service User
E.QnA Maker Read

Correct Answer: C
Option A is incorrect because the owner has access to all functionalities. This would bring up security concerns.
Option B is incorrect because the contributor gets access to all functionalities, except the ability to add new members to the roles. This is a powerful role and should be avoided to grant to all users. 
Option C is correct because QnA Maker Editor role provides access to following KB functionalities for your QnA resource:
Export/Download
Test
Update KB
Export KB
Import KB
Replace KB
Create KB
You can grant this role to all users for them to contribute to the change required for better user experience. Option D is incorrect because Cognitive Service User additionally provides access to publish the resource. However,you would want to follow the review and approval process before publishing the QnA resource.
Option E is incorrect because QnA Maker Read role only grants access to export, download and test the knowledge base.
Reference:
To learn more about Azure RBAC for QnA resources, use the link given below: 

https://docs.microsoft.com/en-us/azure/cognitive-services/qnamaker/reference-role-based-access-control