What command would you use to view running services in a Docker swarm?

The command to view running services in a Docker swarm is 'docker service ls'. This command provides a concise list of all the services that are currently active in your swarm, along with their respective details such as replicas and image used.

Using 'docker service ls', you can quickly ascertain the status of each service deployed in your swarm, allowing you to manage and monitor services effectively. The simplicity and effectiveness of this command make it an essential tool for anyone working with Docker swarm deployments.

In this context, the other options do not correspond to valid commands for listing services. For instance, 'docker service status' and 'docker swarm services' do not exist as Docker commands, and 'docker service list' is not the correct syntax, further emphasizing why 'docker service ls' is the right choice for viewing running services in a swarm.