Answers to mock test three

1. A: "Substitutions are helpful for variables whose value isn't known until build time, or to reuse an existing build request with different variable values. Cloud Build provides built-in substitutions or you can define your own substitutions. Use substitutions in your build's steps and images to resolve their values at build time." For more information, refer to https://cloud.google.com/build/docs/configuring-builds/substitute-variable-values.
2. A: Managed base images follow security best practices – in addition to being maintained with regular patching and testing, they can be rebuilt from scratch reproducibly. By comparing them to the original source, we can verify that no flaws were introduced. For more information, refer to https://cloud.google.com/blog/products/containers-kubernetes/exploring-container-security-let-google-do-the-patching-with-new-managed-base-images.
3. A and C: "When you start working with containers...