Which method ensures the greatest security when erasing data that is no longer needed, according to the Hong Kong Office of the Privacy Commissioner?

Which method ensures the greatest security when erasing data that is no longer needed, according to the Hong Kong Office of the Privacy Commissioner?
A . Strip-shredding paper copies of data.
B . Crosscut shredding paper copies of data.
C . Deleting electronic files containing data.
D . Reformatting USB memory devices containing data.

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Answer: B