Which command would you use to initialize a new Swarm cluster?

To initialize a new Swarm cluster, the correct command is "docker swarm init." This command is specifically designed to set up a new Swarm manager node and establish a Swarm cluster where it can manage multiple Docker nodes. When you execute this command, it will create a new Swarm instance and provide the necessary information for other nodes to join the cluster.

The command not only initializes the Swarm but also configures the node as a manager. This means it can run tasks related to orchestration and management of services and containers across the Swarm. By issuing this command, you lay the foundational aspects of Docker Swarm's orchestration capabilities, enabling distributed applications.

The other choices do not represent valid commands for initializing a Swarm cluster. For example, "docker swarm start" and "docker swarm create" do not exist in the Docker CLI, while "docker swarm bootstrap" may reference concepts related to initiating a service but is not a recognized Docker command for setting up a Swarm. Understanding the purpose and functionality of the "docker swarm init" command is crucial for managing container orchestration effectively in Docker.