What do the diagrams illustrate about the process of transgression? of rock erode over time
B layers of rock build up over time
C layers of rock rise relative to the original shoreline
D layers of rock lower relative to the original shoreline

The answer is C. Luv the higher the shoreline the move sand and rocks there is being pushed and washed there ^_^

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