Which of the following is an example of secondary storage?

A USB flash drive is an example of secondary storage because it is a type of non-volatile memory used to store data and files persistently, even when the power is turned off. Unlike primary storage, such as RAM, which is temporary and loses its data when the computer is powered down, secondary storage is essential for keeping information long-term. Devices like USB flash drives enable users to transfer and store large amounts of data, making them an important part of data management and backup.

The other options listed do not qualify as secondary storage. The CPU is the central processing unit, responsible for executing instructions; it does not store data permanently. A monitor is an output device that displays information visually and does not hold any data itself. RAM, on the other hand, serves as primary storage, providing temporary space for data that is actively being worked on by the CPU; however, it does not store information permanently.