The correct answer is Coldline because it is designed for very-low-cost, highly durable storage for data that is rarely accessed, such as disaster recovery data. Coldline Storage is ideal for data you plan to access at most once a year, offering low latency access when needed. It is more cost-effective for infrequently accessed data compared to other storage classes like Multi-regional, Regional, or Nearline, which are better suited for data that is accessed more frequently. Coldline Storage also provides the flexibility of geo-redundancy when stored in multi-regional locations, enhancing data availability in disaster recovery scenarios.