You work as an administrator at ABC.com. The ABC.com network consists of a single domain

named ABC.com. All servers on the ABC.com network have Windows Server 2008 R2 installed.
ABC.com makes use of System Center 2012, which includes App Controller and Virtual Machine
Manager (VMM). You have previously deployed a service to ABC.com’s production, and staging
environments in the public cloud.
You have been asked to explain to users what an environment swap upgrade is.
Which of the following suitably describes your explanation?

A.
An environment swap replaces the existing binaries and settings with new ones.

B.
An environment swap places the staging environment into the production environment.

C.
An environment swap performs upgrades one domain at a time.

D.
An environment swap requires you to select a new version of the service template.