Concept:During processing, data and instructions are held in fast, temporary memory inside or near the CPU.
Explanation:Cache, RAM, and registers are used to store data while the CPU is actively processing.
ROM holds permanent instructions and is not used for data during processing.
Storage devices like flash drives and hard disks are used only to save data, not to store it during processing.
Therefore, the correct set of devices is Cache, RAM, and Register.
Answer:Option A — Cache, RAM and Register.