Wiretapping and Eavesdropping

Wiretapping and eavesdropping:

A) have from the earliest cases been considered within the protection of the Fourth Amendment.
B) have, at least since the cases of Katz v. United States and Berger v. United States, been within the protection of the Fourth Amendment.
C) are legal and evidence resulting therefrom is admissible where made by state officers if the requirements of the federal law are complied with, even though the state law prohibits either wiretapping or eavesdropping or both.
D) are investigative techniques that are no longer effective because the evidence cannot be used in any court.