Discussion
Which technology uses electromagnetic waves at radio frequencies for data transmission ?
Answer: B
The technology that uses radio-frequency electromagnetic waves is Wi-Fi.
Wi-Fi, the wireless LAN family of IEEE 802.11 standards, transmits data by radio waves, mainly in the 2.4 GHz and 5 GHz bands. That is what lets laptops and phones connect to a network without cables.
The other options use different media. Li-Fi transmits data with visible light from LED lamps, not radio waves. Optical cables carry pulses of light through glass fibre, and co-axial cables carry electrical signals along a copper conductor. Only Wi-Fi uses radio frequencies through the air.
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