You are designing the storage architecture for a new application. The application will use Azure Blob Storage to store user-uploaded documents.

The business requires that the documents remain available even if an entire Azure region goes offline. Furthermore, the application must be able to read the documents from the secondary region immediately, without waiting for Microsoft to initiate a failover.

Which storage redundancy option should you recommend?

Geo-redundant storage (GRS) copies data synchronously three times within a single physical location in the primary region, then copies it asynchronously to a single physical location in the secondary region. However, with standard GRS, the secondary region is not available for read access unless Microsoft initiates a failover. Read-access geo-redundant storage (RA-GRS) provides a secondary endpoint, allowing your application to read data from the secondary region at any time, ensuring high availability for read operations even during a primary region outage.