What is an important function of the physical layer of the OSI model?

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What is an important function of the physical layer of the OSI model?

It accepts frames from the physical media.
It encapsulates upper layer data into frames.
It defines the media access method performed by the hardware interface.
It encodes frames into electrical, optical, or radio wave signals.

Explanation: The physical layer of the OSI model accepts frames from the data link layer and encodes it for transport as bits across the network media.

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