You need to recommend a solution that meets the application development requirements. What should you include in the recommendation?

When you deploy your web app, web app on Linux, mobile back end, or API app to Azure App Service, you can use a separate deployment slot instead of the default production slot when you're running in the Standard, Premium, or Isolated App Service plan tier. Deployment slots are live apps with their own host names.
App content and configurations elements can be swapped between two deployment slots, including the production slot.
Deploying your application to a non-production slot has the following benefits:
* You can validate app changes in a staging deployment slot before swapping it with the production slot.
* Deploying an app to a slot first and swapping it into production makes sure that all instances of the slot are warmed up before being swapped into production.
This eliminates downtime when you deploy your app.
* After a swap, the slot with previously staged app now has the previous production app. If the changes swapped into the production slot aren't as you expect, you can perform the same swap immediately to get your "last known good site" back.
Note: Application Development Requirements
Application developers will constantly develop new versions of App1 and App2. The development process must meet the following requirements:
* A staging instance of a new application version must be deployed to the application host before the new version is used in production.
* After testing the new version, the staging version of the application will replace the production version.
* The switch to the new application version from staging to production must occur without any downtime of the application.
Reference:
https://docs.microsoft.com/en-us/azure/app-service/deploy-staging-slots