Exam AWS Certified DevOps Engineer - Professional DOP-C02 topic 1 question 304 discussion

Why Option A? Zonal Shifts Provide Quick and Controlled Traffic Redirection AWS Route 53 Application Recovery Controller allows you to initiate a zonal shift to temporarily remove an entire Availability Zone (AZ) from service. This is operationally efficient as it does not require manually removing instances or modifying target groups. Disabling Cross-Zone Load Balancing Ensures Proper Traffic Steering If cross-zone load balancing is enabled, the ALB will continue distributing traffic across all AZs even if one AZ is experiencing issues. Disabling it ensures that a zonal shift properly removes traffic from the affected AZ. Maintains Availability and Stability Other AZs will continue handling traffic without disruption. The rollback process can proceed without affecting users.

should be A

Disable Cross-Zone Load Balancing: Disabling cross-zone load balancing ensures that each Availability Zone handles traffic only for its own targets. This enables the ability to isolate traffic away from a specific zone when needed. Initiate a Zonal Shift: AWS offers Zonal Shift (through AWS Elastic Disaster Recovery or AWS Global Accelerator) to temporarily shift traffic away from a specific Availability Zone. This is highly operationally efficient because it allows automated rerouting without manual changes to target groups or instance configurations. A zonal shift can quickly redirect traffic while maintaining high availability and stability for the application during rollback or testing. Ref -https://docs.aws.amazon.com/r53recovery/latest/dg/arc-zonal-shift.html