Which of the following statements best describes transport$-$layer demultiplexing.

Group of answer choices

Receiving a transport$-$layer segment, examining the header fields to identify the receiving socket and directing the segment to the appropriate socket to deliver the data to the application layer.

Receiving a transport$-$layer segment from the network layer, extracting the payload, determining the destination IP address for the data, and then passing the segment and the IP address back down to the network layer.

Taking data from multiple sockets, all associated with the same destination IP address, adding destination port numbers to each piece of data, and then concatenating these to form a transport$-$layer segment, and eventually passing this segment to the network layer.