Your company has an Azure DevOps project. They want to create release pipelines in the DevOps project. The release pipelines need to access secrets stored in an existing Key Vault service. 
Which of the following would you create in your pipeline?

Answer options:

A.Azure Resource manager deployment
B.Azure Resource manager service connection
C.A service principal
D.An Azure AD object

Answer - B 
You have to create a new service connection. 

Since this is clearly mentioned, all other options are incorrect. 
For more information on using the Key Vault from your pipeline, please visit the following URL- 

https://azuredevopslabs.com/labs/vstsextend/azurekeyvault/