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GCP Professional Cloud Security Engineer Practice Question

A software team is building a cross-platform mobile app that lets Google Workspace users view and update objects in their own Cloud Storage buckets. Security has mandated the following:

  • The app must never embed or distribute long-lived Google credentials.
  • Each user must grant only the minimum necessary permissions.
  • Users must be able to withdraw the app's access at any time without changing their passwords. Which approach best satisfies all requirements?

  • Embed an API key restricted to Cloud Storage in the application code and rotate the key monthly.

  • Package a dedicated service account key with the mobile app and grant it the Storage Object Admin IAM role.

  • Implement the OAuth 2.0 authorization-code flow and request only the Cloud Storage read/write scope, storing the refresh token securely on the backend.

  • Use Workload Identity Federation with a public identity pool that maps each device ID to a Storage service account.

GCP Professional Cloud Security Engineer
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