1. The Terraform option that reduces downtime is create_before_destroy.
2. A blue-green deployment infrastructure is composed of one blue and one green environment and a router or load balancer.
3. Both patterns are canary release and dark launch.
4. The Azure components that allow blue-green deployment are the app service slots and the Azure Traffic Manager.
5. The role of feature flags is to enable or disable features of an application without having to redeploy it.
6. The FeatureToogle is a simple feature flag, open-source framework for .NET applications.
7.   LaunchDarkly is a SaaS solution that frees you from any installation.