The correct answer is: C. Microcontroller

A microcontroller is a small computer on a single integrated circuit (IC) that contains a processor, memory, and input/output (I/O) peripherals. Microcontrollers are used in a wide variety of applications, including automotive electronics, industrial control, consumer electronics, and telecommunications.

A memory system is a collection of devices that store data and instructions that can be accessed by a computer. Memory systems can be classified into two main categories: primary memory and secondary memory. Primary memory is directly accessible by the CPU, while secondary memory is not.

An embedded system is a computer system that is embedded in a larger system, such as a car or a washing machine. Embedded systems are typically designed to perform a specific task or set of tasks, and they are often used in real-time applications.

A microprocessor is a central processing unit (CPU) on a single integrated circuit (IC). Microprocessors are used in a wide variety of applications, including personal computers, workstations, servers, and embedded systems.

Microcontrollers are typically less powerful than microprocessors, but they are also less expensive and easier to use. Microcontrollers are often used in applications where size, cost, and power consumption are important considerations.