<span>All of this high-tech fakery happens with the help of backdrops of brightly colored fabric or paint, and a process called "chroma key," also referred to as "green screen" due to the backdrops' color, which is typically a vivid green. ... Chroma keying isn't just for backgrounds; it works with objects, too.</span>
Answer: Rich medium
Explanation: A communication is said to be rich id it provides the services like observing the body language, immediate communication, instant judging of the voice tone etc. These factors are commonly found in the face to face interaction which is considered as the rich source of communication. It is considered as rich medium because it has the capability of receiving the output immediately .
Answer: Macintosh start January 24, 1984
Windows start November 20, 1985
Linux start October 5, 1991
