D WiFi
It uses wifi to connect to the internet
<span>Wireless networks usually use radio (b) signals to send data. </span>
Answer:
Sensing elements.
Explanation:
Sensing elements are the device which connect channels feedback and return it to the control system input. There are many sensors used for feedback control such as Tachometer, Encoders, Accelerometers and rate gyroscopes.
The answer is <em>B.) Close Range Drones</em>
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