单项选择题
A technician plugs a USB device into the front panel of a desktop computer and nothing happens.The technician knows that plug-n-play is enabled. Which of the following BEST describes a possible cause to this issue?（）
A. The technician plugged a USB 2.0 device into a USB 1.1 port.
B. The technician needs to reboot the computer for the device to work.
C. The technician plugged a USB 1.1 device into a USB 2.0 port.
D. The front panel connectors are not plugged into the motherboard.
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