If Evidence Was Seized from a Warrantless Search, Which of the Following

If evidence was seized from a warrantless search, which of the following statements is true?

A) The defendant bears the burden of proving that the evidence was seized without probable cause.
B) The law enforcement officers bear the burden of proving that the search constituted an exception to the search warrant requirement.
C) The evidence is automatically suppressed if seized without a warrant.
D) Both a and c are correct.