C is the answer.
https://learn.microsoft.com/en-us/azure/app-service/deploy-best-practices#use-deployment-slots
Whenever possible, use deployment slots when deploying a new production build. When using a Standard App Service Plan tier or better, you can deploy your app to a staging environment, validate your changes, and do smoke tests. When you are ready, you can swap your staging and production slots. The swap operation warms up the necessary worker instances to match your production scale, thus eliminating downtime.
Given Answer C is correct
Deployment slots are live apps with their own hostnames. App content and configurations elements can be swapped between two deployment slots, including the production slot.
The question was not at all clear. It did not require any requirement of separate Environments for deploying applications within Azure App Service. Bad question.
Answer is C - Deployment Slots
We are dealing with testing then deploying versions of Apps.
As per the Case Study:
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.
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