In Regard to the Fourth Amendment, What Was the Significance

In regard to the Fourth Amendment, what was the significance of the case of United States v. Jacobsen (1984) ?

A) It held that an employee of a private company opening and inspecting the contents of a package is not a violation of the Fourth Amendment.
B) It held that airline employees working for the FAA represent government employees and must obtain a warrant before searching public bags.
C) It held that warrantless searches are allowed in public schools due to a loss of the expectation of privacy in a public setting such as a school, park, or playground.
D) It held that computer technicians are not required to obtain a warrant before notifying law enforcement of possible illegal material found on the item they are repairing.