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.