Which command is used to display the current Docker version?

The command used to display the current Docker version is "docker version." When you run this command in the terminal or command line interface, it fetches and presents detailed information about the Docker client and server, including the version numbers. This command is specifically designed to provide version information, making it the most direct and appropriate choice for checking which version of Docker is currently installed and running on your system.

Using the "docker info" command also provides valuable details about the Docker installation, but it offers more comprehensive system information, including the number of containers, images, and orchestrator details, rather than focusing solely on the version number. The other options like "docker show version" and "docker check version" are not valid Docker commands and do not exist in Docker's command-line interface. Therefore, they cannot be used to check the Docker version, confirming that the original selection is indeed the correct choice.