In IoT, M2M describes devices communicating automatically without human intervention. Which option best matches this definition?

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The main idea is device-to-device automation: devices talking to each other and acting without human input. That’s what two machines doing things for each other describes—sensors, actuators, and controllers exchanging data and commands over a network to perform tasks automatically. That direct device-to-device interaction is what “Machine to Machine” captures.

The other options don’t fit as naturally. Human to Human is about people communicating, not devices. Cloud to Edge describes a data flow pattern between cloud and local devices, which may involve humans and cloud services, but it isn’t the essence of direct machine-to-machine interaction. Bot to Bot implies software agents or bots rather than physical devices communicating autonomously, so it’s not the standard IoT M2M idea.