You operate datacenters in Los Angeles and New York and must choose an Azure storage redundancy option. Requirements: data must be stored on multiple nodes, on nodes in different geographic locations, and data must be readable from the secondary location as well as the primary. Which redundancy option satisfies these requirements?

Read-only geo-redundant storage (RA-GRS) meets all requirements. It stores data on multiple nodes within a primary region, replicates it to a secondary region hundreds of miles away, and allows read access from both the primary and secondary locations. This ensures high availability and disaster recovery. Geo-redundant storage (GRS) also replicates data to a secondary region but does not allow read access from the secondary endpoint unless a failover occurs, failing the "readable from the secondary location" requirement. Zone-redundant storage (ZRS) replicates data across multiple availability zones within a single region, but not to different geographic locations. Locally redundant storage (LRS) stores data within a single datacenter, offering the lowest durability and failing the geographic redundancy requirement.