The correct choice is Amazon S3 Intelligent-Tiering storage class because it automatically optimizes costs by monitoring object access and moving objects between access tiers without manual lifecycle rules and without affecting performance.

Amazon S3 Intelligent-Tiering storage class monitors access patterns and shifts objects into frequent and infrequent access tiers and into optional archive tiers to lower storage costs while charging a small monitoring fee. It removes the need for per-bucket lifecycle configuration which makes it well suited for hundreds of buckets and for datasets with unpredictable or variable access.

Amazon S3 One Zone-Infrequent Access lowers cost but stores data in a single Availability Zone which reduces resilience and is not ideal for regulated or business critical datasets. It also does not remove the need for lifecycle planning when access patterns change.

Amazon S3 on Outposts is intended for local data residency and hybrid workloads and it adds hardware and operational overhead. It does not address regional S3 cost optimization and it increases management responsibilities.

Amazon S3 Glacier Deep Archive offers the lowest storage price but retrievals can take hours and retrieval workflows usually depend on lifecycle rules and planning. That makes it a poor fit when the goal is minimal ongoing IT involvement and when access may be unpredictable.

Full AWS Practitioner Certification Question