A hard disk containing confidential data was damaged beyond repair. What should be done to the hard disk to prevent access to the data residing on it?

A. Rewrite the hard disk with random Os and Is.

B. Low-level format the hard disk.

C. Demagnetize the hard disk.

D. Physically destroy the hard disk.

Explanation:

Physically destroying the hard disk is the most economical and practical way to ensure that the data cannot be recovered. Rewriting data and low-level formatting are impractical, because the hard disk is damaged. Demagnetizing is an inefficient procedure, because it requires specialized and expensive equipment to be fully effective.