Answer:
The answer is D
Explanation:
The answer is easy because read the question again Variety proportion balance and emphasis those are the processes
The bottom line is that the steam wands on the espresso machine need to be cleaned after EVERY use. ... The reason that you need to clean the steam wand after each use is that the milk dries on it very quickly after the frothing process and dried milk is incredibly hard to remove once caked on.