DRAG DROP A developer must containerize a Python application to integrate into a prebuilt CD environment by creating a Docker image. It will be hosted as a web application to enable end users from accessing it remotely. Drag and drop the code from the bottom onto the box where the code is missing in the Docker file Not all options are used.

To create a valid Dockerfile, the instructions must follow a specific logical order:

1. FROM: Every Dockerfile must start with a base image (e.g., python:3.6-alpine).
2. EXPOSE: Since the application is hosted as a web application accessible remotely, it needs to inform Docker that the container listens on port 8080 at runtime.
3. ENTRYPOINT & CMD: When used together in "exec form," ENTRYPOINT defines the main command (python3), while CMD acts as the default flags or arguments (-m, server). This allows the container to run as an executable. EXEC and PORT are not valid Dockerfile instructions.

Docker Documentation: Dockerfile reference - FROM. Defines the initial stage and sets the Base Image for subsequent instructions.

Docker Documentation: Dockerfile reference - EXPOSE. Explains how the instruction functions as documentation between the image developer and the person running the container regarding which ports are intended to be published.

Docker Documentation: Dockerfile reference - ENTRYPOINT vs CMD. Detailed breakdown of how ENTRYPOINT sets the executable and CMD provides default arguments that can be overridden.

Open Container Initiative (OCI): Runtime Specification. Standards regarding how container engines execute commands and handle entrypoints within isolated environments.