Which of the Following Is NOT One of the Three

Multiple Choice

Which of the following is NOT one of the three basic ways to protect electromagnetic emanations?

A) Put the equipment beyond the point that the emanations can be picked up.
B) Provide shielding for the equipment itself.
C) Create a reverse magnetic field around the equipment to cancel out waves emanating from or going to the equipment.
D) Provide a shielded enclosure (such as a room) to put the equipment in.