A company currently has an organization and project defined in Azure DevOps services. For one of the projects, the company wants to gather feedback from users related to certain work items for a particular release. You have to ensure the following. The release team can request feedback from users.
Users have the ability to provide feedback for the work items.
Users have the required tools installed for giving feedback.
You have to ensure that licensing cost is kept to a minimum. 
What should be installed for the users to give feedback for the work items?

Answer options:

A.The Azure DevOps extension
B.The Team Foundation extension
C.The Test & Feedback extension
D.The Test extension

Answer – C 
You have to use the Test & Feedback extension. 
This is also given in the Microsoft documentation. 

Since this is clearly given in the Microsoft documentation, all other options are incorrect. 
For more information on providing feedback, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/devops/project/feedback/get-feedback?view=azure-devops