The answer has to be C. The red line is clearly showing the range of channels used to transmit data efficiently. All the other options just don't seem to fit the diagram.
Haha, the red line is obviously the total length of the wireless signal wavelength. I mean, just look at it - it's so long and wavy, it has to be the wavelength!
I'm not sure, but I think the red line might be showing the pool of channels for the wireless radio to broadcast the signal. It looks like it's covering a range of channels.
The red line definitely represents the range of channels used to allocate available airtime while transmitting data. That's the only option that makes sense based on the diagram.
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