When validating a feature flag's behavior, which aspects should be checked?

• A. Gating logic, fallback behavior, and user experience consistency
• B. Only whether the flag is present in code
• C. Visual appearance of the toggle only
• D. Only the on-state UI

Answer: (C)

The main idea here is that validating a feature flag’s behavior must cover how the flag gates the feature, how it behaves when it can’t be evaluated, and how the experience remains consistent for users. Merely checking that the flag exists in code shows only wiring, not whether the feature actually turns on for the right users or under the right conditions. If the gating logic is wrong, the feature might not be exposed to intended users or could be exposed inadvertently. Focusing only on the visual look of the toggle ignores whether the feature is truly enabled behind the scenes, or how the system should behave if the flag is off or if evaluation fails. The on-state UI alone also misses how the feature presents itself in different states (off, loading, fallback), which can lead to mismatches between what the user sees and what the feature does. So the best checks include gating logic accuracy, safe fallback behavior, and a consistent user experience across scenarios and platforms.