The correct answer is D. ROM.
ROM stands for Read-Only Memory. It is a type of non-volatile memory that is used to store permanent data and instructions. ROM is typically used to store the BIOS (Basic Input/Output System), which is a set of instructions that the computer uses to start up and initialize the hardware.
Core memory, PROM, and EPROM are all types of volatile memory. Volatile memory means that the data stored in it is lost when the power is turned off. Core memory was the first type of semiconductor memory to be used in computers. It was replaced by PROM (Programmable Read-Only Memory) and EPROM (Erasable Programmable Read-Only Memory) in the 1970s and 1980s. PROM and EPROM are both types of ROM that can be programmed by the user. However, PROM can only be programmed once, while EPROM can be erased and reprogrammed multiple times.
None of the above is not the correct answer because ROM is a type of memory that is located in the central processing unit (CPU). The CPU is the part of the computer that is responsible for executing instructions.