How should the run mode be configured to set it to "UAT"?

How should the run mode be configured to set it to "UAT"?
A . Rename the quickstart.jar filename to contain the run mode before the initial UAT installation.
B . Set the run mode in the system properties in the start script on all systems of the UAT environment and restart the system.
C . Configure the run mode on the Felix console of all systems in the UAT environment.
D . Create a configuration package that contains this run mode, deploy it on the author of the UAT environment, and replicate the package.

Answer: B