Which of the following is not an example of primary storage?

Primary storage, also known as main memory, refers to the memory that is directly accessible by the CPU and is used for storing data and instructions that are actively being used or processed. In this context, primary storage includes RAM (Random Access Memory), ROM (Read-Only Memory), and cache memory, all of which are used for immediate data access during computing tasks.

Solid State Drives (SSD), on the other hand, are considered secondary storage. They are used for long-term data storage and are not directly accessed by the CPU in the same way that primary storage is. SSDs hold data that is not currently in use and require a read-write process when the data needs to be accessed, placing them in a different category than the others listed.

Therefore, identifying the SSD as not an example of primary storage is correct since it serves a different purpose in the computer's architecture, primarily related to storage capacity rather than active data processing.