Explanation:

Storage devices like hard drives, SSDs, or flash drives are used to save data permanently (non-volatile storage).

Let’s examine the other options:

• (A) Printer: Outputs data on paper, but doesn't store data.
• (B) CPU: Processes data, but doesn't store it permanently.
• (D) Memory (usually refers to RAM): Temporarily holds data; it's volatile and loses data when power is off.

So, the correct answer is: (C) Storage.