Which of the following provides the GREATEST assurance that any confidential information on a disk is no longer accessible but the device is still usable by other internal users?

Which of the following provides the GREATEST assurance that any confidential information on a disk is no longer accessible but the device is still usable by other internal users?
A . Reformatting the disk
B . Erasing the disk
C . Degaussing the disk
D . Password-protecting the disk

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Answer: A