1. Microsoft Azure Documentation, "Regions and Availability Zones in Azure": This document
explicitly states, "Availability Zones are unique physical locations within an Azure region...
Availability Zones offer high availability to protect your applications and data from datacenter
failures." This supports options A and C by defining zones as intra-region constructs for HA.
URL: https://learn.microsoft.com/en-us/azure/reliability/availability-zones-overview
2. Microsoft Azure Documentation, "Build solutions for high availability using Availability Zones":
This guide details how zones provide fault isolation and redundancy. It clarifies, "To protect your
workloads from datacenter-level failures, you can deploy your resources across multiple zones."
This directly supports the mechanism described in option C.
URL: https://learn.microsoft.com/en-us/azure/architecture/high-availability/building-solutions-for-hi
gh-availability (See section: "Availability Zones")