Which of the following is a computer designed to perform a single fixed function and is often integrated into appliances?

• A. Desktop computer
• B. Laptop
• C. Mainframe
• D. Embedded system

Answer: (D)

An embedded system is a computer designed to perform a single fixed function, and it’s often built right into appliances or devices. These systems use dedicated hardware and software tailored for one task—like controlling a washing machine cycle, regulating a thermostat, or running a microwave timer. They’re typically small, low-power, and real-time, optimized for reliability in a specific job. Because they’re designed for one purpose rather than to run a wide range of programs, they’re different from general-purpose computers like desktops or laptops. Mainframes are large, powerful machines for processing vast amounts of data for many users, not components inside household appliances. So this description points to an embedded system.