Inside a single Azure region, a designer wants the construct made up of one or more physically separate datacentres that each have independent power, cooling, and networking and that act as an isolation boundary. Which construct fits?
- AAn availability zone, a separate datacentre that is an isolation boundary Correct
- BA region pair set up across two regions in one geography
- CA sovereign region isolated for legal or compliance reasons
- DA resource group that logically groups related Azure resources
Why A is correct: Correct. An availability zone is defined as one or more physically separate datacentres within a region, each equipped with independent power, cooling, and networking, deliberately set up as an isolation boundary so that one zone failing leaves the others working.
Why B is wrong: A region pair spans two distinct regions for cross-region recovery, so it operates above the region level rather than as a separate datacentre inside one region, which is what the stem requires.
Why C is wrong: A sovereign region is an isolated instance of Azure for compliance purposes, not a separate datacentre within a normal region acting as a resiliency isolation boundary, so it does not fit.
Why D is wrong: A resource group is a logical management container with no physical datacentre or independent power meaning, so it cannot be the isolation boundary made of separate datacentres.