You plan to deploy a service to Azure virtual machines and need the service to remain available if a datacenter fails. Which option should you include in the virtual machine deployment?

Availability Zones are physically separate locations within an Azure region, each with independent power, cooling, and networking. Deploying virtual machines across multiple Availability Zones ensures that if one datacenter (zone) fails, the service remains available in another zone. Availability Sets distribute VMs across different fault domains (racks) and update domains within a single datacenter, protecting against hardware failures within that datacenter, but not against a complete datacenter outage. Proximity Placement Groups are used to group VMs close together to reduce network latency, not for high availability. Host Groups are dedicated physical servers for your Azure VMs, offering isolation and performance benefits, but not datacenter-level redundancy.