The answer is: 'self-driving' cars
self-driving cars are developed with A.I technology in order to sense the environment around them without needing any control or input from human being. In 2018, it is predicted that car developers approximately have invested around 80 Billion dollar in the development of self-driving cars.
D in this case it probably means who you are to others
I think you need to read a story to answer
Help us grow,be closer with relatives,help us cooraperate work together