Final answer:
RAM is not considered a form of secondary storage.
Step-by-step explanation:
Out of the options provided, RAM is not considered a form of secondary storage.
Secondary storage refers to the devices that are used to store data for long-term use, whereas RAM (Random Access Memory) is a form of primary storage used for temporary data storage when a computer is running.
The other options, Hard disk drive, USB drive, and DVD, are all considered forms of secondary storage as they can store data that persists even when the computer is turned off or restarted.