The correct answer is D. Memory.
Memory is the functional component of a computer that is responsible for the transient or temporary storage used by the CPU. It is a physical device that stores data and instructions that the CPU can access quickly. Memory is typically divided into two types: RAM (random access memory) and ROM (read-only memory). RAM is volatile memory, which means that it loses its contents when the power is turned off. ROM is non-volatile memory, which means that it retains its contents even when the power is turned off.
Input is the process of entering data into a computer. Output is the process of displaying or printing data from a computer. The CPU is the central processing unit of a computer. It is responsible for carrying out the instructions that are stored in memory. Storage is the process of saving data on a permanent medium, such as a hard drive or CD-ROM.
I hope this helps!