Answer is B:
Zigbee is a wireless technology developed as an open global standard to address the unique needs of low-cost, low-power wireless IoT networks. The Zigbee standard operates on the IEEE 802.15. 4 physical radio specification and operates in unlicensed bands including 2.4 GHz, 900 MHz and 868 MHz.
I'm not sure if it's B. according to reference it says :
"
Routers in a Zigbee network act as intermediate nodes between the coordinator and the end devices.
Routers have to join the network first by the permission of the coordinator. Then they can route
2
traffic between end devices and the coordinator, as well as transmit and receive data. A router also
able to allow other routers and end devices to join the network. Similar to the coordinator, routers
also cannot sleep as long as the network is established[3]."
So if I had to test this kind of infrastructure probably I will start from Router... what do you think?
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