You expect to ingest ~25 GB/day of raw data into Cloud Storage. Old data can be deleted anytime, has no fixed access pattern, must be instantly available when accessed, and retrieval must not incur charges. How do you optimize storage cost?

The Autoclass feature automatically transitions objects to the most cost-effective storage class based on access patterns, optimizing costs without manual configuration. It ensures data is instantly available at all times, and retrieval from Autoclass buckets does not incur retrieval fees, aligning with the requirement for no retrieval charges. The other options involve manual Object Lifecycle Management policies that require defining specific transitions to Nearline, Coldline, or Archive storage classes. These classes incur retrieval charges, which violates the requirement that retrieval must not incur charges. Additionally, the question states "old data can be deleted anytime" and "has no fixed access pattern," making manual lifecycle management less efficient than Autoclass, which adapts dynamically.