单项选择题
Tile hardware are the parts of computer itself including the （） (CPU) and related microchips and micro -circuitry, keyboards, monitors, case and （） (including floppy, hard, CD, DVD, optical, tape, etc...). Other extra parts called （） or devices include mouse, printers, （） , scanners, digital cameras and cards (sound, colour, video) etc... Together they are often referred to as a （） or PCs.
Other extra parts called （） or devices include mouse.
A．permanent components
B．peripheral components
C．particular components
D．precise components