When you dispose of a computer or sell used hardware, it is crucial that none of the data on the hard disks can be recovered.

Which of the following actions can you take to ensure that no data is recoverable?

answer

Encrypt all data on the hard disks.

Damage the hard disks so badly that all data remanence is gone.

Delete all files from all the hard disks in the computer.

Reformat all the hard disks in the computer.