The mechanism described as automatically moving less-used data to cloud storage is:

• A. Cloud-based Network Controller
• B. Data Tiering
• C. Backups
• D. Archival System

Answer: (A)

Data tiering is the mechanism at play here. It involves organizing storage into multiple tiers and automatically moving data between them based on how often the data is accessed. The idea is to keep frequently accessed data on fast, more expensive storage, while shifting less-used data to cheaper or cloud storage. This automatic policy-driven relocation is what optimizes both performance and cost without requiring manual intervention.

Archival systems focus on long-term retention and compliance, and backups are copies kept for recovery purposes rather than ongoing lifecycle management across storage tiers. A cloud-based network controller, meanwhile, handles networking control rather than data movement between storage tiers.