The option that has the least volatile data is option C: Hard drive.
A hard disk drive (HDD), often known as a hard disk, hard drive, or fixed disk, is an electro-mechanical data storage device that stores and retrieves digital information utilizing magnetic storage on one or more rigid, quickly rotating platters coated with magnetic material.
Therefore, one can say that the least volatile data of those listed is that found on a hard drive. All other sources are some form of memory, which disappears when a system is switched off.
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