【单选题】【消耗次数：1】
下列设备组中，完全属于外部设备的一组是________。
①
CD－ROM驱动器，CPU，键盘，显示器
②
激光打印机，键盘，CD－ROM驱动器，鼠标器
③
内存储器，CD－ROM驱动器，扫描仪，显示器
④
打印机，CPU，内存储器，硬盘
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