Docker caching

Now that you understand Docker image layers and when they are cached, which of the following statements is correct?

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Docker builds Dockerfiles into images; an image is composed of layers that correspond to specific Dockerfile instructions. A layer can be re$-$used for Dockerfiles with identical instructions.

When we build an image from a Dockerfile, every Dockerfile instruction is run, and the changes it makes to the file system are saved. The bundle of these changes to the file system is called a layer.

Image layer caching can be complex, but it allows us to understand how to greatly increase the speed with which we can iterate on$,$ i$.$e$.,$ improve or fix bugs in our images.

All of the above.