Which of the Following Is Not True Regarding Electronic Eavesdropping

Which of the following is not true regarding electronic eavesdropping?

A) An effective countermeasure to detect evidence of electronic eavesdropping in telephone equipment should be conducted by a person who is technically familiar with such equipment.
B) An effective countermeasure would be to conduct a physical search as well as an electronic search.
C) All wiring should be traced and accounted for.
D) A listening device installed in a wire will cause a crackling sound, click, or other noise that can be heard on the line.
E) None of the above.