As a Cloud Architect, you have been asked to implement a robust backup strategy for an application's data stored in Google Cloud Storage. You are required to ensure that the data is geographically isolated and can withstand the loss of an entire region. What would be the best configuration?

*Explanation:* To implement a robust backup strategy for data in Google Cloud Storage with geographical isolation and the ability to withstand the loss of an entire region, the best choice is the **Dual-Region storage class**. This configuration ensures geographical isolation and redundancy across multiple regions, making it resilient to regional failures. Other options like Multi-Region storage class (may not provide the required isolation), Nearline storage class with geo-redundancy (doesn't guarantee geographical isolation), Coldline storage class with geo-redundancy (similarly lacks geographical isolation), and Standard storage class with a specific region set (does not offer geographical isolation or regional redundancy) are not as suitable for this specific requirement.