Your organization has been moving to cloud. There are different departments and no way to figure out who owns which resources. You decided to put up an effort to bring some guidelines and order. You are using Azure resource manager to organize resources and enforce standards. 
You created a resource group, ‘testComRG’.You need to ensure that no VM gets created in the resource group without associating it to a department. 
How will you ensure this? Choose an option from below.

Answer options:

A.Assign ‘Department’ tag with a value to the resource group.
B.Assign ‘Department’ tag with a value to each VM.
C.Create a policy and assign it to the resource group.
D.Create a policy and assign it to each VM.

Answer:C 

https://docs.microsoft.com/en-us/learn/modules/control-and-organize-with-azure-resource-manager/
https://docs.microsoft.com/en-us/learn/modules/control-and-organize-with-azure-resource-manager/