Explanation:

The question asks about a storage location where data persists even after the computer is turned off. This characteristic defines non-volatile storage. Option A, 'RAM (Random Access Memory)', is a type of primary storage that is volatile; any data stored in RAM is lost once the power supply is removed. Thus, it does not fit the description. Option B, 'Mother Board', is the main circuit board of a computer that connects all components; it is not a data storage device for user files. Option C, 'Secondary storage device' (e.g., Hard Disk Drive, Solid State Drive, USB flash drive), is specifically designed for long-term, non-volatile data storage. Data saved to these devices remains intact even when the computer is powered off. This perfectly matches the requirement. Option D, 'Primary storage device', generally refers to RAM and CPU cache, which are volatile, or ROM, which is non-volatile but not typically where users save their dynamic data. In the context of saving user data for persistence, secondary storage is the appropriate term. Therefore, saving data to a secondary storage device ensures its integrity after power-off.