Exam Preparation Quiz

Explanations for each answer:

• Progressive exposure is incorrect. Progressive exposure (also known as canary deployment) gradually routes users to new versions, but it doesn't typically use specific URLs for testing and doesn't optimize for easy promotion or rollback as required.
• Feature toggle is incorrect. Feature toggles are configuration switches set per user or user group, not linked to specific URLs. Users have no control over feature enablement as these are managed by administrators. They also don't provide the easy promotion path or rollback capabilities required in the scenario.
• A/B testing is incorrect. A/B testing randomly assigns users to variation A or B. Users cannot control which version they see by visiting a specific URL. It's primarily focused on comparing different versions to gather metrics about user behavior and preferences, rather than providing an efficient deployment strategy with easy promotion and rollback capabilities.
• Blue/green is correct. Blue/green deployment makes it easy to roll back to previous versions and provides specific URLs for testing new features, meeting all the requirements of the scenario.