The correct options are Deployment rings and Feature flags.

Deployment rings are designed to release a new application version to progressively larger groups of users so you can monitor behavior and rollback if issues appear before affecting everyone.

Feature flags let you enable or disable specific functionality for defined cohorts or individual users so you can expose new features gradually without redeploying code.

Blue green deployment focuses on switching traffic between two full environments to achieve low downtime and quick rollback, and it is typically an all or nothing swap unless you add extra traffic splitting mechanisms.

Incremental rollout is an ambiguous term that overlaps with the controlled exposure achieved by deployment rings and feature flags, and it is not presented here as a distinct staged exposure mechanism for the purposes of this question.

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