What is the MOST cost-effective storage solution alternative to the current configuration?

A company is processing data on a daily basis. The results of the operations are stored in an Amazon S3 bucket analyzed daily for one week and then must remain immediately accessible for occasional analysis

What is the MOST cost-effective storage solution alternative to the current configuration?
A . Configure a lifecycle policy to delete the objects after 30 days.
B . Configure a lifecycle policy to transition the objects to Amazon S3 Glacier after 30 days
C . Configure a lifecycle policy to transition the objects to Amazon S3 Standard-Infrequent Access (S3 Standard-IA) after 30 days
D . Configure a lifecycle policy to transition the objects to Amazon S3 One Zone-Infrequent Access (S3 One Zone-IA) after 30 days

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Answer: D