Which answer choice correctly distinguishes among the three pieces of data? Piece of data 1 has no footer, but it does have an IP address.Piece of data 2 has no headers.Piece of data 3 has a footer.

A packet contains an IP address in its network-layer header and does not have a footer, so piece 1 is a packet. Piece 2 has no headers, which fits data before protocol headers are added. A frame includes a footer, so piece 3 is a frame. Therefore, the correct choice is D: packet, data, frame.

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