Which of the following groupings of animals is mismatched? A. Spiders, grasshoppers, crayfish
B. Octipi, squids, clams
C. Polychaetes, earthworms, leeches
D. snails, earthworms, slugs

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it

4) repetitive change