Three Azure virtual machines (VM1, VM2, VM3) run a multi‑tier application and you plan to use Azure Site Recovery. You need to ensure these three VMs fail over together as a single unit. What should you configure?

A recovery plan in Azure Site Recovery allows you to group virtual machines and configure their failover order, network settings, and scripts to automate recovery. This ensures that multi-tier applications, like the one running on VM1, VM2, and VM3, fail over together as a single, cohesive unit, maintaining application consistency. An availability zone is a high-availability offering that protects applications and data from datacenter failures within an Azure region, but it doesn't orchestrate the failover of multiple VMs as a single unit. An availability set is a logical grouping capability for isolating VM resources from each other when they're deployed, ensuring that if hardware or software failure occurs, only a subset of your VMs is affected. Neither availability zones nor availability sets provide the coordinated failover capabilities of a recovery plan.