Concept:ROM (Read Only Memory) is a non-volatile memory that stores permanent, fixed instructions.
Explanation:The instructions in ROM are preset during manufacturing and are not lost when the computer is turned off.
These instructions are needed to start the computer and operate the basic hardware.
RAM holds the current program in operation and is volatile, so options A and D are incorrect.
User instructions are stored on storage devices, not in ROM, so option C is incorrect.
Therefore, ROM contains preset instructions for operation.
Answer:B. preset instructions for operation.