The correct answer is: B. Laptops
Laptops are portable computers that are small enough to be carried around easily. They are typically powered by batteries and have a built-in screen, keyboard, and mouse. Laptops are often used by students, business people, and travelers.
Supercomputers are the most powerful computers in the world. They are used for complex scientific and engineering calculations. Supercomputers are typically very large and expensive.
Mini computers are smaller than mainframe computers, but larger than personal computers. They are often used for business applications.
File servers are computers that store and manage files. They are typically used in businesses and organizations.
E. None of these is the correct answer.