Google Cloud Certified Associate Cloud Engineer Practice

The flag you should use when deploying to App Engine to prevent the version from getting 100% of the traffic is "--no-promote". This flag prevents the new version from automatically receiving all incoming traffic and allows the user to manually specify the amount of traffic the new version should receive.

The other options are incorrect because

- "--no-balance" is not a valid flag for App Engine deployments.

- "--no-traffic" does not specifically target the percentage of traffic and instead prevents traffic from being routed to the newly deployed version at all.

- "--traffic-limit" is not a valid flag for App Engine deployments.

Overall, only "--no-promote" directly addresses the issue of controlling the percentage of traffic a new version receives.