Answer: Create an S3 bucket that has object versioning enabled., Configure a default retention period of 30 days for the objects., Configure an S3 Lifecycle policy to expire the objects after 30 days.

## Explanation To meet the requirements of backing up on-premises VMs to Amazon S3 with 30-day retention and automatic deletion, the correct combination is: **B. Create an S3 bucket that has object versioning enabled.** - Object versioning is necessary to properly manage object lifecycle and prevent accidental deletion during the retention period. **C. Configure a default retention period of 30 days for the objects.** - This ensures that objects are protected from deletion for exactly 30 days, meeting the retention requirement. **E. Configure an S3 Lifecycle policy to expire the objects after 30 days.** - This automatically deletes the objects after the 30-day retention period, meeting the automatic deletion requirement. ### Why the other options are incorrect: **A. Create an S3 bucket that has S3 Object Lock enabled.** - S3 Object Lock is for write-once-read-many (WORM) compliance scenarios, not for simple retention and deletion requirements. It's overkill for this use case. **D. Configure an S3 Lifecycle policy to protect the objects for 30 days.** - S3 Lifecycle policies don't "protect" objects; they manage transitions and expirations. The protection comes from versioning and retention settings. **F. Configure the backup solution to tag the objects with a 30-day retention period** - While object tagging can be used with lifecycle policies, it's not necessary for this solution. The default retention period configured at the bucket level is simpler and more effective. ### How the solution works: 1. **Object versioning** keeps multiple versions of objects and prevents permanent deletion 2. **Default retention period** of 30 days ensures objects cannot be deleted before 30 days 3. **Lifecycle expiration policy** automatically deletes objects after 30 days This combination provides both the required retention protection and automatic cleanup after the retention period ends.

Author: LeetQuiz Editorial Team