The correct answer is B. ROM.
ROM stands for Read-Only Memory. It is a type of memory that is used to store permanent data and instructions. The BIOS is a program that is stored in ROM. It is responsible for initializing the hardware and loading the operating system when the computer is turned on.
RAM stands for Random Access Memory. It is a type of memory that is used to store temporary data and instructions. The operating system and applications are stored in RAM while they are being used. RAM is volatile, which means that it loses its contents when the power is turned off.
The CPU is the Central Processing Unit. It is the main processor in the computer. It is responsible for executing instructions. The CPU is not a type of memory.
Memory cache is a type of memory that is used to store frequently accessed data. It is located on the CPU and is faster than RAM.