5G is the correct answer because it provides significantly lower latency, higher reliability, and better support for moderate to high data rates compared to its predecessors. This makes it particularly suitable for IoT devices that require up-to-date connectivity for real-time data processing and transmission. While 4G does offer improved data rates and lower latency compared to 3G, it cannot match the low latency and high reliability provided by 5G, which is vital for certain IoT applications. 3G has been largely superseded by newer technologies and thus does not support the requirements for modern IoT devices which may demand higher performance.