Correct Answer: D
First you have to realize that the question is specifically talking about a CDROM.
The information stored on a CDROM is not in electro magnetic format, so a degausser woud be
inneffective.
You cannot sanitize a CDROM but you might be able to sanitize a RW/CDROM. A CDROM is a
write once device and cannot be overwritten like a hard disk or other magnetic device.
Physical Damage would not be enough as information could still be extracted in a lab from the
undamaged portion of the media or even from the pieces after the physical damage has been
done.
Physical Destruction using a shredder, your microwave oven, melting it, would be very effective
and the best choice for a non magnetic media such as a CDROM.
Source: TIPTON, Hal, (ISC)2, Introduction to the CISSP Exam presentation.