Computer Concept Courses (CCC) Practice Test 2025 – Comprehensive All-in-One Guide to Exam Success!

The operating system of a cell phone is primarily stored in ROM, which stands for Read-Only Memory. This type of memory is non-volatile, meaning it retains its contents even when the power is turned off. In the case of mobile devices, the operating system is essential for managing hardware resources and providing a user interface, and it needs to be booted every time the device is powered on.

ROM is suitable for this purpose because it is specifically designed to store firmware and system software that seldom changes. Although options like RAM or Flash memory also store data, they serve different functions. RAM (Random Access Memory) is used for temporary storage while the device is in operation and loses its data when powered off. Flash memory, while often interchangeable in casual conversation with ROM, specifically refers to a type of non-volatile storage that can be rewritten and is commonly used for storing applications and files. External storage generally refers to devices like SD cards, which can be removed and are used for additional data storage but do not typically house the operating system.

Thus, understanding the role of ROM in storing the operating system clarifies why it is the correct choice in this context.