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.