Microsoft Azure Solutions Architect Expert AZ-305 Practice Question

Read-access geo-redundant storage (RA-GRS) replicates each block or page blob synchronously three times within a single primary region (LRS) and then asynchronously copies those updates to a secondary region hundreds of miles away. This meets the requirement to survive a regional failure. Because the secondary endpoint is exposed in a read-only mode, applications can continue to read the replicated data if the primary region is offline, satisfying the requirement for read availability during a disaster. Standard GRS also provides cross-regional durability but keeps the secondary endpoint inaccessible for reads, so it does not meet the read-access requirement. ZRS protects only against zonal failures inside one region, and LRS keeps all replicas within a single datacenter-neither meets the regional outage requirement. RA-GZRS would exceed requirements but at a higher cost than RA-GRS, so RA-GRS offers the needed durability and protection at the lowest qualifying price.