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In App Center, the virtual machine (VM) used for building an app is discarded after the app is built. This means that once a build is complete, the VM is not retained for future use. This design choice promotes a fresh environment for each build process, ensuring that no residual state affects subsequent builds. It also enhances security by minimizing the chance of exposing previous build artifacts and dependencies that may not be relevant to the next build.

Using a new VM for every build can improve consistency and reliability, ensuring that every build is executed in a controlled environment. It allows for builds to be isolated from each other, which can help in identifying issues related to build configurations, dependencies, or platform-specific problems without interference from past builds.

The other options present different strategies for VM management that are not how App Center operates. For example, reusing VMs might lead to inconsistent build results due to lingering artifacts or configurations, while archiving VMs or updating them with the latest software would not align with the build strategy of providing a clean slate for each build process. This unique management of resources supports streamlined and efficient CI/CD practices in the DevOps lifecycle.