
Explanation
According to the Huawei documents and resources, the definitions of the short-range wireless IoT technologies are as follows:
ZigBee: IEEE 802.15.4-based wireless communication technology is a short-range, and low-power wireless communication technology that supports star, mesh, and hybrid networking.
Bluetooth: With the emergence of IoT industries such as smart wearables, smart home, and Internet of Vehicles, short-range communication technologies are attracting more and more developers.
REID: Its basic principle is to automatically identify objects based on the transmission characteristics of radio signals and space coupling (inductance or electromagnetic coupling) or radar reflection.
Wi-Fi: Wireless networking technology based on IEEE 802.11 is the most popular WLAN technology.
Therefore, ZigBee - 1, Bluetooth - 3, REID - 2, Wi-Fi - 4 is the correct answer. References: :
https://support.huawei.com/enterprise/en/doc/EDOC1100158948/9a0d5c37/zigbee :
https://support.huawei.com/enterprise/en/doc/EDOC1100158948/9a0d5c37/bluetooth :
https://support.huawei.com/enterprise/en/doc/EDOC1100158948/9a0d5c37/rfid :
https://support.huawei.com/enterprise/en/doc/EDOC1100158948/9a0d5c37/wi-fi