An administrator would like to lower storage costs by only keeping frequently accessed data on FC disks, less accessed data on low cost SATA disks, and seldom accessed data on optical media. Which of

Content-Addressable Storage (CAS) is a method of storing data using content-derived identifiers, primarily for data integrity and immutability, not for automated tiering based on access frequency.

Direct-Attached Storage (DAS) refers to storage connected directly to a server, describing a connectivity model rather than a tiered data management strategy.

Hierarchical Storage Management (HSM) is a data management technique that automatically migrates data between various storage media types, such as fast FC disks, slower SATA disks, and archival optical media. This migration is typically based on data access patterns, ensuring frequently accessed data resides on high-performance storage while less accessed data moves to more cost-effective tiers.

Archiving is the general process of moving inactive data to long-term storage, but it does not specifically describe the automated, policy-driven tiering across multiple storage types that HSM provides.