What allows for read access in the secondary region while using Read-Access geo-redundant storage (RA-GRS)?

Read-Access geo-redundant storage (RA-GRS) enables read access to data in a secondary region when the primary region becomes unavailable. The way this functionality is achieved is through asynchronous data copying.

In RA-GRS, data is replicated across two geographically distinct regions. This replication process occurs asynchronously, meaning that changes made to the data in the primary region are copied to the secondary region after a delay. This ensures that while the primary region is constantly updated, the secondary region still contains a recent copy of the data, which can be accessed for read operations.

The asynchronous nature of this replication allows for high availability and durability of data. Even if the primary region faces an outage or becomes inaccessible for any reason, users can still perform read operations against the secondary region. As a result, they can retrieve the most recent data available, albeit with the understanding that any updates made to the primary region may not be immediately reflected in the secondary region due to the asynchronous copying process.

This makes the option concerning asynchronous data copying the key enabler for read access in the secondary region under the RA-GRS configuration.