The correct answer is C (Coldline) because Coldline storage is designed for archival of infrequently accessed data at a low cost. It's ideal for data that needs to be stored long-term but accessed rarely, such as compliance archives. Coldline offers very-low-cost, highly durable storage with data available within milliseconds, not hours or days. It's best suited for data accessed at most once a year, considering its slightly lower availability, 90-day minimum storage duration, and costs for data access. Options A (Regional), B (Nearline), and D (Multi-regional) are not optimized for archival data storage.