Which command allows users to view running containers?

The command that allows users to view running containers is "docker ps." This command is specifically designed to display a list of all currently running containers on the Docker host, including essential information such as container IDs, names, status, and port mappings.

Using "docker ps" without any additional flags will show only containers that are actively running. If you want to see all containers, including those that are stopped, you can use "docker ps -a." This functionality is crucial for managing and monitoring containers, as it helps users quickly ascertain the state of their workloads.

The other options do not correspond to valid Docker commands for listing running containers. For instance, "docker list" and "docker show" do not exist in Docker's command set, and "docker containers" is not a proper command for obtaining the desired output. This reinforces the importance of knowing the correct commands to effectively utilize Docker's capabilities.