The correct choice is Use an S3 Lifecycle rule to transition objects to S3 Standard-Infrequent Access 30 days after creation. This option preserves immediate access and high availability while lowering storage cost for data that is accessed only occasionally after the initial heavy query period.

Use an S3 Lifecycle rule to transition objects to S3 Standard-Infrequent Access 30 days after creation is appropriate because Standard-Infrequent Access offers multi Availability Zone durability and supports instant retrieval so analysts can run ad hoc queries without restore delays. The class is priced for infrequent access and has a 30 day minimum storage duration so scheduling the transition at 30 days avoids early transition penalties and aligns costs with access patterns.

Create an S3 Lifecycle rule to move objects to S3 One Zone-Infrequent Access after 7 days is not suitable because One Zone IA stores data in a single Availability Zone and that does not meet the high availability requirement.

Configure an S3 Lifecycle rule to transition objects to S3 Standard-Infrequent Access after 7 days is incorrect because Standard-IA has a 30 day minimum storage duration and transitioning at 7 days would violate that constraint and be cost inefficient.

Transition objects to S3 Glacier Flexible Retrieval after 7 days is not acceptable because Glacier Flexible Retrieval requires restore operations that introduce minutes to hours of latency and that prevents immediate access for ad hoc analysis.

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