Explanation:
B is correct because routing all the traffic back to a previous version is the fastest way to roll back a change on App Engine. This method allows you to quickly revert to a stable version without deploying new instances or making DNS changes. A is incorrect as deploying a separate version and changing DNS settings introduces unnecessary complexity. C is incorrect because 'gcloud app restore' is not a valid command for this purpose. D is incorrect since there's no 'revert' option on the App Engine page in the GCP Console. For more details, refer to Google Cloud's documentation on traffic migration.
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After deploying a website for selling used smartphones on App Engine, you noticed the user interface breaks for some users in the latest release, an issue not present in prior versions. To immediately revert to an older version and mitigate this issue, what should you do?
A
Deploy the original version as a separate application and change DNS settings to point to the new application.
B
Open the GCP Console and go to the App Engine Versions page, then route 100% of the traffic to the previous version.
C
Run gcloud app restore.
D
Open the GCP console, go to the App Engine page, and click on revert.