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The correct answer is C (ENTRYPOINT). In Docker, the ENTRYPOINT instruction is used to define the primary executable that should run when a container starts. Once defined, the container acts as if it were an executable file. By using the exec form ["executable", "param1", "param2"], you ensure that the application receives Unix signals (like SIGTERM) properly, which is critical for graceful shutdowns in orchestrated environments like Kubernetes. Why the others are incorrect: A & B: These are base image references used with the FROM instruction to define the environment. They are not executable commands. D (RUN): The RUN instruction executes commands during the build process (to create the layers of the image). It is not meant for starting the application when the container launches. E (FROM): This is used to initialize a new build stage. Putting this in the final line would attempt to start a new, redundant stage instead of defining how to run the app. Best Practices in Multi-Stage Builds The provided Dockerfile follows a standard pattern for optimizing image size: Build Stage: Uses the large SDK image containing compilers and tools. Runtime Stage: Uses the lightweight aspnet image. By copying only the published output (/app/out) from the build stage, you create a production-ready image that is significantly smaller and more secure, as it does not contain the source code or build tools.