The correct options are Deployment rings and Feature flags.

Deployment rings let you stage releases by rolling changes out to progressively larger groups of users. This approach limits the blast radius and gives you time to validate behavior in production before exposing everyone to the update.

Feature flags let you toggle features at runtime so you can enable functionality for a small subset of users or turn it off instantly if a problem appears. Feature flags provide fine grained control for progressive exposure and fast rollback without a redeploy.

Blue green deployment uses two complete environments and switches traffic from the old to the new environment in a single cutover. That reduces downtime risk but does not provide the same staged, progressive validation as the selected answers.

Canary releases are another progressive rollout technique used in many pipelines, but this question identifies Deployment rings and Feature flags as the intended strategies so Canary releases is not chosen here.

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