title: Product of Sum(POS) or Sum of Product(SOP) after Karnaugh map simplification
body: <p>I am just curious on how do I determine whether a simplified boolean expression is in a SOP form or POS form.
  for example this question:
  <a href="https://i.stack.imgur.com/wvnqV.png" rel="nofollow noreferrer">Question</a></p>
  
  <p>the answer to this expression is : NOT B.D/ ⌝B.D
  and this is in SOP form
  Can anyone explain why?</p>