You have a project in Azure DevOps named Project1 that contains two environments named environment1 and environment2. When a new version of Project is released,...

You have a project in Azure DevOps named Project1 that contains two environments named environment1 and environment2.
When a new version of Project is released, the latest version is deployed to environment2, and the previous version is redeployed to environment1.
You need to distribute users across the environments. The solution must meet the following requirements:
• New releases must be available to only a subset of the users.
• You must gradually increase the number of users that can access environment2.
What should you use?

A. VIP swaping B. web app deployment slots C. Azure Load Balancer D. Azure Traffic Manager