Answer:
Receiver’s preference and level of technical expertise
Explanation:
This is very important because any well prepared information presented using a communication channel that the target audience does not use or prefer is a wasted effort.
For example, a company that wants to target elderly people with its products, having been aware through a survey that they prefer television ads to online ads. Which means that because of their limited technical expertise, a tv ad is the best channel of communication.
Ask someone else to drive you home, do not drive under the influence.
"Dad looked more Jeremy than Tom Cruise"
"Danced on my taste buds"
The target for an audience for an open letter is a specific individual! For more information go to: https://en.wikipedia.org/wiki/Open_letter
A MacGuffin is that object in a film which is critical to the characters, but carries insignificant meaning for the audience.
A MacGuffin, a term introduced and widely used by Alfred Hitchcock is some element which drives the plot. The audience is not very concerned with the specifics of it.