A client's application must remain operational even if an entire Azure datacenter goes offline. What should they implement?
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Correct answer: Availability Zone.
Why this is the answer
An Availability Zone is a physically separate location within an Azure region, comprising one or more datacenters equipped with independent power, cooling, and networking. Deploying resources across multiple Availability Zones ensures application availability even if one zone (and its datacenters) experiences an outage. Azure Backup is for data recovery, not continuous application operation during a datacenter outage. Azure Advisor provides recommendations for optimizing Azure resources, not a high-availability solution itself. Azure Bastion provides secure RDP/SSH connectivity to virtual machines, unrelated to datacenter-level resilience.
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