Which command is used to view all available Docker commands?

Using the command 'docker help' provides a comprehensive view of all available Docker commands. When executed, this command displays a list of commands along with a brief description of what each command does. It serves as a quick reference guide for users to familiarize themselves with Docker's extensive command set, including both high-level commands and those specific to particular operations.

In contrast, the other options do not represent valid commands within Docker. There is no 'docker commands', 'docker list commands', or 'docker command list' command in Docker's CLI. Hence, they would not provide any output related to available commands, reinforcing the correctness of 'docker help' as the right choice for viewing all the commands within Docker.