Who is credited with popularizing the term rock and roll?

The answer is Alan Freed.

Alan Freed created the term 'rock and roll"

Your answer has to be c

If your choices are: -cropping  -anti-aliasing-imperfection-contrastdownsampling is done to decrease the bit rate when transmitting over a limited bandwidth or to convert to a more limited audio format. this is the opposite of upsampling. so the answer is contrast.