__ is not located in the system unit Select one: a. ROM b. CD c. CPU d. FAN Clear my choice

The correct answer is b. CD.<br /><br />The system unit, also known as the computer case or tower, is the main body of a computer that houses the internal components. It typically includes the motherboard, central processing unit (CPU), random access memory (RAM), storage drives, power supply, and other components.<br /><br />ROM (Read-Only Memory) is a type of memory that stores firmware or software that is essential for the computer's boot-up process. It is typically located on a chip inside the system unit.<br /><br />The CPU (Central Processing Unit) is the brain of the computer and is also located inside the system unit.<br /><br />The FAN (Fan) is a cooling device that helps to dissipate heat from the internal components of the computer. It is also located inside the system unit.<br /><br />On the other hand, a CD (Compact Disc) is an optical disc that stores data in the form of pits and lands on its surface. It is not located inside the system unit but is read or written by an optical drive, which is typically connected to the computer via a cable that connects to the motherboard's USB or IDE ports.<br /><br />Therefore, the correct answer is b. CD.