Which statement is true?
a.
opinions can be scientifically tested.
b.
scientific theories are absolute and cannot be changed.
c.
scientists have learned all they’ll ever know about science.
d.
facts can be scientifically tested.

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