Question

The job of delivering the data in a transport-layer segment to the correct socket is called

Answer 1

The job of delivering the data in a transport-layer segment to the correct socket is called multiplexing.

The job of gathering data at the source host from different application processes, enveloping the data with header information (which will later be used in demultiplexing) to create segments, and passing the segments to the network layer is called multiplexing.