Carrier sense multiple access with collision detection (csma/cd) to minimize collisions in the network, thereby increasing data transmission efficiency. place the following steps of its operation in the order in which they occur after a collision. a. all hosts have equal priority to transmit after the timers have expired.
b. each device on the ethernet segment stops transmitting for a short time until the timers expire.
c. the collision invokes a random backoff algorithm.
d. a jam signal informs all devices that a collision occurred.

well cos like a ds it doesn't really die out, unlike for example, fifa, they always come out with a new version, so lets say your fifa 18 is charging you to update the teams and stuff, so, if messi were to go to real madrid (never gonna happen) it would switch messi to the other team, until the owners of fifa come out with fifa 19, then the game would eventually stop updating, and back to the ds, it doesn't really stop working after sometime because there's lots of things that it could be used for, and idk if u know what i'm saying, but long story short, samsung, represents the ds, if they still work, and people love them but not the new version, the old version still works, so they don't really force people to buy new phones, get me?