Answer By Gemini

The best answer is C. Storage Object Admin.

Here's why:

• Storage Object Admin (roles/storage.objectAdmin): This role grants comprehensive control over objects (files) within Cloud Storage buckets. It allows users to create, delete, modify, and read objects, as well as manage object metadata. This is typically the most appropriate role for someone who needs full control over the contents of the buckets.

• Why other options are less suitable:

  • A. Project Editor (roles/editor): This role is too broad. It grants edit access to all resources within the project, not just Cloud Storage. Granting this level of access is a security risk and violates the principle of least privilege.

  • B. Storage Admin (roles/storage.admin): This role grants full control over buckets themselves, including creating, deleting, and modifying bucket properties. While it also includes object permissions, it's more powerful than necessary if your colleagues only need to manage objects within existing buckets. It's best to grant the least privilege.

  • D. Storage Object Creator (roles/storage.objectCreator): This role only allows users to create objects. It doesn't grant permissions to read, modify, or delete existing objects. This is insufficient if your colleagues need to manage the full lifecycle of objects.

Google's Recommendation: Google recommends following the principle of least privilege. This means granting only the minimum necessary permissions required to perform a task. In this scenario, Storage Object Admin provides the necessary permissions to manage objects without granting excessive access to other project resources.