Which App Service feature lets a developer push updates to a staging environment without affecting production?

Deployment Slots allow you to deploy different versions of your web app to separate environments (slots) under the same App Service plan. This enables you to deploy a new version to a staging slot, test it thoroughly, and then swap it into production with zero downtime, without impacting the live application. App Insights is an Application Performance Management (APM) service for monitoring live web applications. Azure Monitor is a comprehensive monitoring solution for Azure resources. Azure Bastion provides secure and seamless RDP/SSH connectivity to your virtual machines directly through the Azure portal, without requiring public IP addresses. These services do not facilitate zero-downtime deployments through environment swapping.