Google Cloud Associate Cloud Engineer — Question 230

You need to migrate invoice documents stored on-premises to Cloud Storage. The documents have the following storage requirements:

• Documents must be kept for five years.
• Up to five revisions of the same invoice document must be stored, to allow for corrections.
• Documents older than 365 days should be moved to lower cost storage tiers.

You want to follow Google-recommended practices to minimize your operational and development costs. What should you do?

Answer options

• A. Enable retention policies on the bucket, and use Cloud Scheduler to invoke a Cloud Function to move or delete your documents based on their metadata.
• B. Enable retention policies on the bucket, use lifecycle rules to change the storage classes of the objects, set the number of versions, and delete old files.
• C. Enable object versioning on the bucket, and use Cloud Scheduler to invoke a Cloud Functions instance to move or delete your documents based on their metadata.
• D. Enable object versioning on the bucket, use lifecycle conditions to change the storage class of the objects, set the number of versions, and delete old files.

Correct answer: D

Explanation

Option D is correct because it allows for the management of document versions while also utilizing lifecycle conditions to optimize storage costs by changing classes based on age. Option A fails to address the need for versioning, while option B does not mention object versioning, which is crucial for maintaining multiple revisions. Option C lacks lifecycle management for storage class changes, which is necessary for cost efficiency.