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You have an existing App Engine application that you need to update. You want to test the new version using production traffic before making it the default version. What is the correct procedure to accomplish this?
A
Deploy the update using the Instance Group Updater to create a partial rollout, which allows for canary testing.
B
Deploy the update as a new version in the App Engine application, and split traffic between the new and current versions.
C
Deploy the update in a new VPC, and use Google's global HTTP load balancing to split traffic between the update and current applications.
D
Deploy the update as a new App Engine application, and use Google's global HTTP load balancing to split traffic between the new and current applications.
