Which of the following describes the method of placing lesser used data on less costly storage while reserving more expensive storage for more frequently used or valuable data?

Single Instance Storage (SIS) is a data deduplication technique that stores only one copy of identical files, regardless of how many times they appear.

Content Addressable Storage (CAS) is an archiving technology that stores and retrieves data based on its content rather than its physical location, often used for data integrity and immutability.

Storage Tiers involve classifying data based on its importance and access frequency, then assigning it to different storage media (tiers) with varying performance and cost characteristics. Hierarchical Storage Management (HSM) is a system that automates the migration of data between these tiers, typically moving less frequently accessed data to slower, less expensive storage and more frequently accessed data to faster, more expensive storage.

Object Oriented Storage (or Object Storage) manages data as objects, which are self-contained units with data, metadata, and a unique identifier, often used for large amounts of unstructured data, but it doesn't inherently describe data migration based on usage.