Identify the Choice That Best Completes the Statement or Answers

Identify the choice that best completes the statement or answers the question.
-The data string for a standard transaction may be compared to

A) a collage of many parts of a claim placed in random order.
B) a line of various size train cars with a header and trailer.
C) the rings of a tree with the most important part inside, surrounded by larger pieces of data.
D) complete gibberish nonsense that must be de-encrypted by a computer to be understood.