AWS Certified Data Engineer Associate DEA-C01 Practice Question

A data engineer stores web clickstream logs in an Amazon S3 bucket. The logs must be queried frequently for the first 30 days, accessed only a few times between day 31 and day 120, retained for audit for 5 years, and then deleted. Retrieval within several hours after day 120 is acceptable. Which S3 Lifecycle rule most cost-effectively meets these requirements?

Transition objects to S3 Standard-IA 30 days after creation, to S3 Glacier Instant Retrieval 120 days after creation, and retain them indefinitely.
Transition objects to S3 One Zone-IA 30 days after creation, to S3 Glacier Flexible Retrieval 90 days after creation, to S3 Glacier Deep Archive 180 days after creation, and expire them 5 years after creation.
Transition objects to S3 Standard-IA 30 days after creation, transition them to S3 Glacier Deep Archive 120 days after creation, and expire them 5 years after creation.
Transition objects to S3 Intelligent-Tiering 30 days after creation and expire them 5 years after creation.

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Answer Description

Moving the objects to S3 Standard-IA after 30 days provides lower storage cost while still allowing millisecond access for occasional queries. After 120 days, S3 Glacier Deep Archive is the lowest-cost storage class that still allows retrieval within 12 hours, which satisfies the "within several hours" requirement. Finally, adding an expiration action ensures that the data is automatically deleted after five years, meeting the retention policy. The other options either use more expensive classes (Intelligent-Tiering, Glacier Instant Retrieval), introduce unnecessary transitions and reduced resiliency (One Zone-IA), or omit the required deletion action.

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