You need the ability to instantly roll back a new GKE application release. Which deployment model provides that capability?

A blue/green deployment strategy involves running two identical production environments: "blue" (the current version) and "green" (the new version). Traffic is routed entirely to the blue environment. Once the green environment is fully deployed and tested, traffic is instantly switched from blue to green. This allows for immediate rollback by simply switching traffic back to the blue environment if issues arise with the new version. Rolling deployments update instances incrementally, making immediate rollback of the entire application more complex. A/B testing focuses on comparing user experience for different versions, not instant rollback. Canary deployments gradually shift traffic to the new version, which offers a controlled rollout but not instant full rollback.