Which statement describes a difference between SaltStack and Ansible?

SaltStack is an agent-based configuration management system, meaning it requires a "minion" agent to be installed and running on each managed device (like a Cisco switch or router) to execute commands and apply configurations. In contrast, Ansible is agentless; it primarily uses SSH to connect to remote devices and execute commands directly, without needing any special software installed on the target device itself. This distinction is fundamental to their operational models. The other options are incorrect: SaltStack does not use an Ansible agent or an API proxy agent in the described manner, nor does Ansible rely on Telnet or an event bus for device interaction. While both can use SSH, the core difference lies in the agent requirement.