Law Enforcement Officers May Conduct a Search or Seize Evidence

Law enforcement officers may conduct a search or seize evidence when they believe they are operating according to the dictates of the law,and if later discover that a mistake was made,the evidence they find can still be used in court.Which exception to the exclusionary rule is this?

A) Plain view doctrine
B) Exclusionary rule
C) Fruit of the poisonous tree
D) Good faith exception