An architect is optimizing the cost of a large Amazon S3 data lake. The data lake contains petabytes of data. Data is accessed frequently for the first 30 days, occasionally for the next 60 days, and rarely after 90 days, but must be kept indefinitely for compliance. Which TWO lifecycle policies provide the MOST cost-effective solution without requiring application changes? (Select TWO)

Answer options:

Transition objects to S3 Standard-IA after 30 days.

Transition objects to S3 One Zone-IA after 30 days.

Transition objects to S3 Glacier Deep Archive after 90 days.

Transition objects to S3 Intelligent-Tiering immediately.

Enable S3 Object Lock in compliance mode.

Transition objects to Amazon EBS Cold HDD (sc1).

How to approach this question

Map the predictable access patterns (30 days, 90 days) to the appropriate S3 storage classes.

Full Answer

Transition objects to S3 Standard-IA after 30 days. Transition objects to S3 Glacier Deep Archive after 90 days.

Because the access pattern is predictable, explicit lifecycle rules are the most cost-effective. S3 Standard-IA is ideal for the 30-90 day window (occasional access). S3 Glacier Deep Archive provides the lowest cost for data older than 90 days that must be retained indefinitely.

Common mistakes

Choosing Intelligent-Tiering when the access pattern is already known and predictable.

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