The best choice is Amazon S3 Glacier Flexible Retrieval.

Amazon S3 Glacier Flexible Retrieval is built for long term archival storage with infrequent access and it provides very low storage costs while allowing retrievals that complete in minutes to hours. This fits the requirement to retain compliance records for nine years with very rare access and with retrieval within a few hours being acceptable. The class also supports lifecycle transitions and cost effective bulk retrievals which keep ongoing expenses low.

Amazon S3 Intelligent-Tiering is designed for datasets with unpredictable access patterns and it automatically moves objects between tiers. It can include archive tiers but it is generally not as straightforward or as cost optimized as choosing a dedicated archive class when long term retention is known.

Amazon S3 One Zone-Infrequent Access (S3 One Zone-IA) stores data in a single Availability Zone and it lowers cost for infrequently accessed but quickly needed data. It is not ideal for durable regulatory archives because it lacks multi Availability Zone resilience.

Amazon S3 Standard is optimized for frequent access and low latency and it carries a higher storage cost than archival classes. It is not cost effective for records that are rarely accessed over nine years.

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