A team wants to use Azure Pipelines for the continuous deployment of applications. The applications need to be deployed onto a set of Azure virtual machines. 
Which of the following can be used to prepare the virtual machines?

Answer options:

A.Azure Pipeline Agent extension
B.Deployment groups
C.Release builds
D.Release gates

Answer – B 
You can use an extension to deploy the agent onto Azure virtual machines instantly. This is also mentioned in the Microsoft documentation. 

Since this is clearly mentioned in the Microsoft documentation, all other options are incorrect. 
For more information on using deployment groups, please refer to the following link- 

https://docs.microsoft.com/en-us/azure/devops/pipelines/release/deployment-groups/?view=azure-devops