Configure licensing and activation for the VMs

QUESTION 
A company has one central data center and five branch offices. Each office has three Hyper-V host servers that
run Windows Server 2012 R2 Datacenter edition. Each branch office has a system administrator. You plan to
deploy virtual machines (VMs) that run Windows Server 2012 R2 Standard edition to each branch office.
You have the following requirements:
The VMs must be activated at the branch offices, even if the branch office has no Internet connectivity.
Activation keys must NOT be shared with the branch office administrators.
You must be able to track license usage from the central location, even without access rights to the VMs.
You must be able to verify license compliance and perform real time reporting on license usage from a central
location.
You need to configure licensing and activation for the VMs.
Which feature or tool should you use?

A. Multiple Activation Key (MAK)
B. Volume Activation Management Tool (VAMT)
C. Key Management Service (KMS)
D. Automatic Virtual Machine Activation (AVMA)
Correct Answer: D