Which statement describes signaling at the physical layer?

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Which statement describes signaling at the physical layer?

Sending the signals asynchronously means that they are transmitted without a clock signal.
In signaling, a 1 always represents voltage and a 0 always represents the absence of voltage.
Wireless encoding includes sending a series of clicks to delimit the frames.
Signaling is a method of converting a stream of data into a predefined code

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