A company has just setup an Azure subscription and an Azure tenant. They want to use services that would fulfil different requirements. Which of the following can be used for the following requirement? 
“Ensure that only virtual machines of a particular SKU size can be launched within an Azure subscription”

Answer options:

A.Azure resource locks
B.Azure Policies
C.Azure Blueprints
D.Azure resource tags

Answer : B 
This can be accomplished with the use of Azure Policies. With Azure policies, you can use an in-built policy to specify the SKU size that can be used to launch an Azure virtual machine. 
As shown below, there is already an in-built policy that can be used for this purpose. 

Option A is incorrect since this used to protect from the accidental deletion of resources
Option C is incorrect since this used to orchestrate the deployment of resources
Option D is incorrect since this used to logically organize resources
For more information on Azure policies, please visit the below URL 

https://docs.microsoft.com/en-us/azure/governance/policy/overview