A company has a set of virtual machines defined in Azure. They want to explore options on how costs can be cut down for the running cost of the virtual machines. Which of the following is an option that can be considered for cutting down the costs without impacting the services running on the virtual machine?

Answer options:

A.Deallocate the public IP address from the virtual machine.
B.Look at buying Reserved Instances.
C.Stop the virtual machines.
D.Change the resource group of the virtual machine.

Answer – B 
The company can consider buying Reserved Instances to get discounts on the virtual machines` running costs. 
The Microsoft documentation mentions the following. 

Options A and C are incorrect since these options could impact the services running on the virtual machine. 
Option D is incorrect since the resource group itself has no impact on the cost. 
For more information on Azure Reserved Instances, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/virtual-machines/windows/prepay-reserved-vm-instances