The correct option is B Input Devices and Output Devices
Every component of computer is either an input device and output device. Before computer can process your data you need some method to input the information. so the device which provides this information is known as input devices . We have many input devices like: keyboard, pointing devices, mouse, joystick, scanner, MIDI devices. output devices are when computer has processed your data you need some device to display that output . Some of the output devices are: CRT monitor, laser printer, sound output( multimedia player)