How would you answer an interview scenario involving availability zones and regions in Cloud Architecture?

For an interview scenario involving availability zones and regions, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Regions are geographic cloud locations and availability zones are isolated failure domains within many regions. For production, map every dependency to its failure domain, use multi-zone services first, and add multi-region only when business recovery requirements justify it. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.