Match the definition$/$function of an element or approach in a networked streaming video system, with its name.

Group of answer choices

A unit of video, each of which may be encoded at multiple different rates, stored in different files.

A file containing the location and encoding rate of files corresponding to video segments in a video.

An approach that allows a client to adapt the encoding rate of retrieved video to network congestion conditions.

A CDN approach that stores content in access networks, close to clients.