B is correct.
The Docker CLI can be used on any machine to interact with the Docker Engine and manage Swarm clusters. However, the CLI is just a client that interacts with the Docker daemon. It does not, by itself, create or register the machine as a node in the Swarm cluster.
yes ! It could be physical or virtual and is called "node" in Docker Swarm. The node can join the swarm (manager) as a worker using the token generated from this command : $ docker swarm join-token worker
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