What is the most secure way to dispose of information on a CD-ROM? 

Answer options:

A. Sanitizing
B. Physical damage
C. Degaussing
D. Physical destruction

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.