The Supreme Court in Olmstead V

The Supreme Court in Olmstead v. United States (1928) involving the use of wiretapping by law enforcement officers held that there was no search because

A) The officers did not physically intrude on the defendants' offices or houses.
B) The defendants did not have any reasonable expectation of privacy in the contents of their conversations.
C) The defendants did not have any objective expectation of privacy in areas outside their house.
D) None of the above.