Computer ComponentsDescription(A) RAM Random Access Memory allows your computer to perform its everyday tasks like loading applications, browsing the internet, editing a spreadsheet, etc. It holds programs currently being run on the computer and allows users to switch among these programs. (B) DVD - ROMDigital Versatile Disk - Read Only Memory is used to permanently store data files. DVD - ROM can be written only once and read arbitrarily many times. They are widely used to distribute large software applications that exceed the CD - ROM capacity. (C) ALUArithmetic Logic Units enable computers to perform all computations and comparison operations, mathematical operations on binary numbers. They can be found at the heart of every digital computer and are one of the most important functions of a CPU. (D) CPUThe Central Processing Unit is the brain of the computer. The CPU is constantly following instructions of computer programs that tell it which data to process and how to process. The CPU is also known as the processor or microprocessor. Therefore, from the above explanation, it is clear that option 3) is the correct answer.