Which storage device is primarily used for long-term data storage?

The correct choice for long-term data storage is the solid-state drive (SSD). SSDs store data persistently, meaning that the information remains intact even when the power is turned off. This makes them ideal for retaining operating systems, applications, and personal files over extended periods.

SSDs use flash memory to store data, which allows for faster access speeds compared to traditional hard disk drives (HDDs) and also offers durability since they have no moving parts. This combination of speed, reliability, and longevity makes SSDs a popular choice for users needing efficient long-term data storage solutions.

In contrast, random-access memory (RAM) is a type of volatile memory, meaning it loses all stored data when the power is turned off, making it unsuitable for long-term storage. The arithmetic logic unit (ALU) and the central processing unit (CPU) are components of a computer involved in processing data and executing instructions, but they do not store data permanently. Thus, neither the ALU nor the CPU serve the purpose of long-term data storage functionalities.