How do you build a Docker image from a Dockerfile?

To build a Docker image from a Dockerfile, the correct command is "docker build." This command invokes Docker's build engine to process the instructions defined in the Dockerfile and create an image based on those specifications. The command typically takes the path to the directory containing the Dockerfile as an argument.

Using "docker build" allows developers to automate the process of packaging applications and their dependencies into a container image, which can then be run on any system that has Docker installed. This is fundamental in DevOps practices and containerization, facilitating consistent deployment environments.

In contrast, the other options do not represent valid commands for building Docker images. "docker image build" does not exist as a command; the correct format combines the build process with image creation in a single command. "docker create image" and "docker image create" are also not valid commands in Docker's CLI; they suggest a command structure that does not exist, which leads to confusion regarding Docker image management. Thus, "docker build" is the standard and accepted method for creating images.