If You See a Teacher in Your Building Not Following

If you see a teacher in your building not following the law as it pertains to a specific student, what should you do?

A) Tell the parent of the student what you have seen
B) File a complaint with the State Department of Education
C) Ignore it because it isn't any of your business
D) Tell the teachers in the building
E) Talk with the principal about what you have observed and be objective in your reporting