title: Determine the highest normal form
body: <p>I really have no clue how to figure this out. I've read through all the normal forms, but still have trouble understanding it. I hope someone can help me understand it. </p>
  
  <p>Relation schema is R(A,B,C,D,E,F) with (A -> BCD, BC -> DE, B -> D, D -> A).</p>
  
  <p>What is the highest normal form and why?</p>
  
  <p>Any help is appreciated, thanks.</p>