Which of the following is the most reliable, secure means of removing data from magnetic storage
media such as a magnetic tape, or cassette?

A.
Degaussing

B.
Parity Bit Manipulation

C.
Certification

D.
Buffer overflow

Explanation:
An alternating current (AC) bulk eraser (degausser) is used for complete erasure of data and other
signal on magnetic media. Degaussing is a process where magnetic media is exposed to a powerful,
alternating magnetic field. Degaussing removes any previously written data, leaving the media in a
magnetically randomized (blank) state. The degausser must subject the media to an alternating
magnetic field of sufficient intensity to saturate the media and then by slowly withdrawing or
reducing the field leaves the magnetic media in a magnetically neutral state.