Which of the following is a protocol optimized for long-range, low-power IoT communication?

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Long-range, low-power operation in IoT relies on networks that let devices sleep most of the time while still reaching distant gateways. LoRaWAN is built for exactly that: battery-powered end devices communicating over kilometers through gateways to a network server, often achieving multi-year battery life with very low data rates. It uses a star-of-stars topology and operates in unlicensed bands, leveraging adaptive data rate and duty-cycle management to maximize reach and minimize power use. In contrast, Z-Wave focuses on home-area coverage with limited range, Thread targets reliable local mesh networks for homes rather than wide-area reach, and NFC is meant for ultra-short-range proximity interactions, not long-distance communication. So LoRaWAN is the best choice for long-range, low-power IoT communication.