Which approach allows safe deployment by enabling new capabilities for subsets of users before full rollout?

Which approach allows safe deployment by enabling new capabilities for subsets of users before full rollout?

• A. Feature flags to toggle features for subsets of users
• B. Cross-region replication
• C. Edge deployment
• D. Immutable infrastructure

Answer: (A)

Feature flags let you gate new capabilities behind a switch and enable them for only a subset of users during rollout. This supports safe deployment because you can release the feature to a small, controlled group, observe performance and gather feedback, and then either expand the rollout or quickly turn the feature off if issues arise—without redeploying or impacting everyone. This approach embodies progressive delivery: you can gradually increase the enabled audience or apply a percentage rollout as confidence grows. Other options focus on data replication, distributing code to edge locations, or maintaining immutability of deployed code, but none inherently provide per-user gating and safe, incremental rollout.

Feature flags let you gate new capabilities behind a switch and enable them for only a subset of users during rollout. This supports safe deployment because you can release the feature to a small, controlled group, observe performance and gather feedback, and then either expand the rollout or quickly turn the feature off if issues arise—without redeploying or impacting everyone. This approach embodies progressive delivery: you can gradually increase the enabled audience or apply a percentage rollout as confidence grows. Other options focus on data replication, distributing code to edge locations, or maintaining immutability of deployed code, but none inherently provide per-user gating and safe, incremental rollout.