Which of the following is considered both an input device and an output device?

A) Central processing unit
B) Keyboard
C) Printer
D) Modem
E) Scanner

Output Device

A hardware component used to convey information to one or more people by converting data into a human-readable form, such as monitors and printers.

Input Device

A hardware device used to send data to a computer allowing the user to interact with and control it. This includes devices like keyboards and mice.