Answer: Phase out
Explanation:
From the given/case scenario, it is provided that the CD players are no longer available in the market since there has been a rapid improvement in technology and thus sit has become obsolete. But the makers of these CD players have gained access to new technology in order to explore and thus do not want resources to go to waste while also trying to prolong life of this obsolete technology. Therefore we can state that this is an example of phase out, which refers to discontinuation of practice, production, or in other words the use of the phases .