An organization is deploying a business-critical workload in an Azure region that supports availability zones. The engineering team needs to implement an architectural strategy that meets the following criteria: - Protects services and data from datacenter-wide outages, such as local power or cooling loss. - Synchronously replicates data across physically separate datacenters within the same region. - Automatically detects zone failures and maintains operations without requiring manual failover procedures. Which architectural approach should the organization implement?

A zone-redundant service deployment: ### What Zone-Redundant Services Are **Zone-redundant services** replicate data and distribute platform resources automatically across multiple **availability zones** within a single Azure region. Each availability zone is made up of one or more physical datacenters equipped with independent power, cooling, and networking infrastructure. ### How It Meets the Requirements - **Protects against datacenter failures**: Because resources and data span multiple independent zones, a complete failure of one datacenter does not take down the entire service. - **Synchronous replication**: Within an Azure region, availability zones are connected by high-performance networks with round-trip latency under 2 milliseconds, enabling **synchronous data replication** across zones. - **Automated failover and detection**: The Azure platform automatically monitors zone health and routes traffic away from an impaired zone to healthy zones without requiring administrator intervention. ### Key Advantages and Capabilities - **High Availability and Higher SLAs**: Distributing instances across availability zones offers higher **Service Level Agreement (SLA)** uptime guarantees compared to single-datacenter configurations. - **Zero-touch recovery**: The platform handles traffic rerouting and fault detection dynamically. - **Low latency**: Provides multi-datacenter resiliency without the higher latency penalties associated with cross-region replication. - **Sequenced platform updates**: Azure coordinates safe deployment practices to update only one availability zone at a time in a region. ### Why This Is Optimal A **zone-redundant service deployment** delivers the best balance of low inter-zone latency, automated resilience against datacenter disruptions, and simplified management within a single geographic region.

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