You need to add an additional tier to the service

You have a deployment of System Center 2012 R2 Virtual Machine Manager (VMM).
You deploy a service by using a service template.
You need to add an additional tier to the service. The solution must minimize the amount of downtime for the service.
What should you do first from the Virtual Machine Manager console?.

A.
Create a new version of the service template.

B.
Use the Clone option.

C.
Create a new service template.

D.
Use the Scale Out option.