Concept:Primary memory is the internal storage area that the CPU can access directly for executing instructions and holding active data.
Explanation:Primary memory is broadly classified into two main categories: Random Access Memory (RAM) and Read Only Memory (ROM).
RAM is volatile, meaning its contents are lost when power is switched off, and it temporarily stores data and instructions during processing.
ROM is non-volatile, so it retains data even without power, and it permanently stores essential startup instructions.
Therefore, the correct and complete division of primary memory includes both RAM and ROM.
Options mentioning registers, mass storage, or auxiliary memory describe other parts of a computer system, not primary memory.
Answer:D. random access memory and read only memory