You are running an application in Google App Engine that is serving production traffic. You want to deploy a risky but necessary change to the application. It c...

You are running an application in Google App Engine that is serving production traffic. You want to deploy a risky but necessary change to the application. It could take down your service if not properly coded. During development of the application, you realized that it can only be properly tested by live user traffic. How should you test the feature?

A. Deploy the new application version temporarily, and then roll it back. B. Create a second project with the new app in isolation, and onboard users. C. Set up a second Google App Engine service, and then update a subset of clients to hit the new service. D. Deploy a new version of the application, and use traffic splitting to send a small percentage of traffic to it.