Which of the following methods is a way to superficially delete files on a hard drive?

Drilling involves physically damaging the hard drive by creating holes in it, which renders the data irretrievable. This method is not superficial; rather, it is a destructive method of data destruction that eliminates physical components of the drive.

Degaussing uses a strong magnetic field to disrupt the magnetic domains on the hard drive, effectively erasing all data stored on it. This method is also not superficial, as it completely destroys the data and renders the drive unusable.

Shredding typically refers to physically destroying the hard drive by shredding it into small pieces. Similar to drilling, this is a destructive method that ensures data cannot be accessed, rather than a superficial deletion.

Low-level formatting is a process that prepares a hard drive for use by creating tracks and sectors, but it does not effectively delete files in a way that prevents their recovery. It can sometimes leave data recoverable, making it inadequate for secure data removal.